chore(renovate): move config under renovate/ and validate it in CI

The config lived in renovate.json at the repo root while everything else
Renovate-related sat under renovate/, and renovate/config.js was a second,
unused source of truth. Both are gone: renovate/renovate.json is now the
only config file.

Because the CronJob in the cluster cannot read the repository, its
ConfigMap carries an inlined copy of the config. That copy is generated,
and sync-renovate-configmap.sh --check now fails the build when it drifts
from the source file.

The workflows also stop carrying a copy of the renovate/renovate image
tag. They read it from renovate/k8s/cronjob.yaml, so the version validated
in CI is the version that actually runs in the cluster.

ci.yaml validates the config with renovate-config-validator, checks the
generated ConfigMap, and kubeconforms the CronJob's own manifests.

.gitea/workflows/renovate-ci.yaml

@@ -10,30 +10,52 @@ on:
 jobs:
   validate-renovate:
     runs-on: [self-hosted, linux, arch, homelab]
+    timeout-minutes: 20
     steps:
       - name: Checkout repository
         uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
 
-      - name: Validate Renovate Compose draft
+      # renovate/k8s/cronjob.yaml is the single source of truth for the image tag,
+      # so the same version that runs in the cluster is the one validated here.
+      - name: Resolve the deployed Renovate image
+        id: image
         shell: bash
         run: |
           set -euo pipefail
-          trap 'rm -f renovate/.env' EXIT
-          printf '%s\n' \
-            'RENOVATE_ENDPOINT=https://gitea.example/api/v1' \
-            'RENOVATE_TOKEN=test-token' \
-            'RENOVATE_REPOSITORIES=forust/homelab' \
-            > renovate/.env
-          docker compose -f renovate/renovate-compose.yaml config --quiet
+          image="$(sed -n 's|.*image:[[:space:]]*\(renovate/renovate:[^[:space:]]*\).*|\1|p' \
+            renovate/k8s/cronjob.yaml | head -1)"
+          if [ -z "$image" ]; then
+            echo "::error::no renovate/renovate image found in renovate/k8s/cronjob.yaml"
+            exit 1
+          fi
+          echo "using $image"
+          echo "image=$image" >> "$GITHUB_OUTPUT"
 
-      - name: Validate Kubernetes manifests
+      - name: Validate Renovate repository config
         shell: bash
         run: |
           set -euo pipefail
           docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            ghcr.io/yannh/kubeconform:latest \
+            -v "$PWD/renovate:/opt/renovate:ro" \
+            -e RENOVATE_CONFIG_FILE=/opt/renovate/renovate.json \
+            "${{ steps.image.outputs.image }}" \
+            renovate-config-validator /opt/renovate/renovate.json
+
+      # The CronJob cannot read the repository, so renovate/k8s/configmap.yaml
+      # carries an inlined copy of the config. Fail if it no longer matches.
+      - name: Check the generated Renovate ConfigMap
+        shell: bash
+        run: |
+          set -euo pipefail
+          ./.gitea/workflows/sync-renovate-configmap.sh --check
+
+      - name: Validate Renovate Kubernetes manifests
+        shell: bash
+        run: |
+          set -euo pipefail
+          tools_dir="$(bash .gitea/workflows/install-ci-tools.sh kubeconform)"
+          export PATH="$tools_dir:$PATH"
+          kubeconform \
             -strict \
             -ignore-missing-schemas \
             -summary \
@@ -41,12 +63,11 @@ jobs:
             renovate/k8s/configmap.yaml \
             renovate/k8s/cronjob.yaml
 
-      - name: Validate Renovate repository config
+      - name: Validate Renovate Compose file
         shell: bash
         run: |
           set -euo pipefail
-          docker run --rm \
-            -v "$PWD:/work" \
-            -w /work \
-            renovate/renovate:44.103.0 \
-            renovate-config-validator renovate.json
+          source .gitea/workflows/compose-lint.sh
+          mapfile -t safe_flags < <(compose_safe_flags)
+          validate_compose_file renovate/renovate-compose.yaml \
+            ${safe_flags[@]+"${safe_flags[@]}"}

.gitea/workflows/renovate-run.yaml

@@ -28,18 +28,36 @@ concurrency:
 jobs:
   run-renovate:
     runs-on: [self-hosted, linux, arch, homelab]
+    timeout-minutes: 60
     steps:
       - name: Checkout repository
         uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
 
+      # renovate/k8s/cronjob.yaml is the single source of truth for the image tag.
+      # Reading it here means this workflow validates and runs the exact version
+      # that is deployed, instead of a copy that silently goes stale.
+      - name: Resolve the deployed Renovate image
+        id: image
+        shell: bash
+        run: |
+          set -euo pipefail
+          image="$(sed -n 's|.*image:[[:space:]]*\(renovate/renovate:[^[:space:]]*\).*|\1|p' \
+            renovate/k8s/cronjob.yaml | head -1)"
+          if [ -z "$image" ]; then
+            echo "::error::no renovate/renovate image found in renovate/k8s/cronjob.yaml"
+            exit 1
+          fi
+          echo "using $image"
+          echo "image=$image" >> "$GITHUB_OUTPUT"
+
       - name: Validate Renovate config
         shell: bash
         run: |
           set -euo pipefail
           docker run --rm \
-            -v "$PWD/renovate/config.js:/opt/renovate/config.js:ro" \
-            -e RENOVATE_CONFIG_FILE=/opt/renovate/config.js \
-            renovate/renovate:44.103.0 \
+            -v "$PWD/renovate/renovate.json:/opt/renovate/renovate.json:ro" \
+            -e RENOVATE_CONFIG_FILE=/opt/renovate/renovate.json \
+            "${{ steps.image.outputs.image }}" \
             renovate-config-validator
 
       - name: Run Renovate
@@ -56,14 +74,14 @@ jobs:
           : "${RENOVATE_TOKEN:?missing RENOVATE_TOKEN secret — add a renovate-bot PAT in repo/org Actions secrets}"
 
           docker run --rm \
-            -v "$PWD/renovate/config.js:/opt/renovate/config.js:ro" \
+            -v "$PWD/renovate/renovate.json:/opt/renovate/renovate.json:ro" \
             -e RENOVATE_PLATFORM=gitea \
             -e RENOVATE_ENDPOINT=https://gitea.forust.xyz/api/v1 \
             -e RENOVATE_TOKEN="$RENOVATE_TOKEN" \
             -e RENOVATE_GITHUB_COM_TOKEN="${RENOVATE_GITHUB_COM_TOKEN:-}" \
             -e RENOVATE_REPOSITORIES="${RENOVATE_REPOSITORIES:-forust/homelab}" \
             -e RENOVATE_DRY_RUN="${RENOVATE_DRY_RUN:-}" \
-            -e RENOVATE_CONFIG_FILE=/opt/renovate/config.js \
+            -e RENOVATE_CONFIG_FILE=/opt/renovate/renovate.json \
             -e RENOVATE_BASE_DIR=/tmp/renovate \
             -e LOG_LEVEL="${LOG_LEVEL:-info}" \
-            renovate/renovate:44.103.0
+            "${{ steps.image.outputs.image }}"

.gitea/workflows/sync-renovate-configmap.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+# Regenerates renovate/k8s/configmap.yaml from renovate/renovate.json.
+#
+# renovate/renovate.json is the single source of truth: the CronJob, the Compose
+# file and the renovate-run workflow all mount that exact file. A ConfigMap cannot
+# read a file from the repository, so the same bytes are inlined here as a literal
+# block. This script keeps the copy honest:
+#
+#   .gitea/workflows/sync-renovate-configmap.sh          # rewrite in place
+#   .gitea/workflows/sync-renovate-configmap.sh --check  # fail if out of date
+#
+# renovate-ci runs the --check form on every PR and push, so a config change that
+# forgets to regenerate the ConfigMap cannot be merged.
+set -euo pipefail
+
+here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+repo="$(git -C "$here" rev-parse --show-toplevel)"
+
+src="$repo/renovate/renovate.json"
+dst="$repo/renovate/k8s/configmap.yaml"
+[ -f "$src" ] || {
+  echo "missing $src" >&2
+  exit 1
+}
+
+render() {
+  cat <<'HEADER'
+# GENERATED FILE - do not edit by hand.
+# Source: renovate/renovate.json
+# Regenerate: .gitea/workflows/sync-renovate-configmap.sh
+# Verify:     .gitea/workflows/sync-renovate-configmap.sh --check
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: renovate-config
+  namespace: renovate
+data:
+  renovate.json: |
+HEADER
+  sed 's/^/    /' "$src"
+}
+
+if [ "${1:-}" = "--check" ]; then
+  if ! diff -u "$dst" <(render) >/dev/null 2>&1; then
+    echo "ERROR: $dst is out of sync with renovate/renovate.json"
+    echo "Run: .gitea/workflows/sync-renovate-configmap.sh"
+    diff -u "$dst" <(render) || true
+    exit 1
+  fi
+  echo "renovate/k8s/configmap.yaml is in sync with renovate/renovate.json"
+  exit 0
+fi
+
+render >"$dst"
+echo "wrote $dst"