ci: keep gitea workflows only, harden and speed up pipelines

Drop duplicated .github/workflows (helm blocks ported to .gitea deploy first). Add ci concurrency with cancel on branches, pin checkout to SHA and prettier to 3.9.8, registry layer cache for image builds. renovate-run gains config validation and dry-run input.

.gitea/workflows/ci.yaml

@@ -7,6 +7,11 @@ on:
   pull_request:
   workflow_dispatch:
 
+# Fast pushes on a branch cancel superseded runs; main is never cancelled.
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
 env:
   REGISTRY: gcr.forust.xyz
 
@@ -15,7 +20,7 @@ jobs:
     runs-on: [self-hosted, linux, arch, homelab]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
 
       - name: Check formatting with Prettier
         shell: bash
@@ -35,13 +40,13 @@ jobs:
             -v "$PWD:/work" \
             -w /work \
             node:22-alpine \
-            sh -lc 'npx --yes prettier@3 --check --ignore-unknown "$@"' sh "${prettier_files[@]}"
+            sh -lc 'npx --yes prettier@3.9.8 --check --ignore-unknown "$@"' sh "${prettier_files[@]}"
 
   lint-ruff:
     runs-on: [self-hosted, linux, arch, homelab]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
 
       - name: Lint Python with Ruff
         shell: bash
@@ -56,7 +61,7 @@ jobs:
     runs-on: [self-hosted, linux, arch, homelab]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
 
       - name: Lint YAML syntax
         shell: bash
@@ -82,7 +87,7 @@ jobs:
     runs-on: [self-hosted, linux, arch, homelab]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
 
       - name: Lint Dockerfiles
         shell: bash
@@ -107,7 +112,7 @@ jobs:
     runs-on: [self-hosted, linux, arch, homelab]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
 
       - name: Validate Kubernetes manifests
         shell: bash
@@ -139,7 +144,7 @@ jobs:
       services: ${{ steps.services.outputs.services }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
         with:
           fetch-depth: 0
 
@@ -230,7 +235,10 @@ jobs:
                 for tag in "${tags[@]}"; do
                   build_args+=(-t "${image}:${tag}")
                 done
-                docker build "${build_args[@]}" dtek_notif
+                docker build \
+                  --cache-from "type=registry,ref=${image}:buildcache" \
+                  --cache-to "type=registry,ref=${image}:buildcache,mode=max" \
+                  "${build_args[@]}" dtek_notif
                 for tag in "${tags[@]}"; do
                   docker push "${image}:${tag}"
                 done
@@ -250,7 +258,10 @@ jobs:
                 for tag in "${tags[@]}"; do
                   build_args+=(-t "${image}:${tag}")
                 done
-                docker build "${build_args[@]}" errorpages
+                docker build \
+                  --cache-from "type=registry,ref=${image}:buildcache" \
+                  --cache-to "type=registry,ref=${image}:buildcache,mode=max" \
+                  "${build_args[@]}" errorpages
                 for tag in "${tags[@]}"; do
                   docker push "${image}:${tag}"
                 done
@@ -280,7 +291,10 @@ jobs:
                   for tag in "${tags[@]}"; do
                     build_args+=(-t "${image}:${tag}")
                   done
-                  docker build "${build_args[@]}" "$context"
+                  docker build \
+                    --cache-from "type=registry,ref=${image}:buildcache" \
+                    --cache-to "type=registry,ref=${image}:buildcache,mode=max" \
+                    "${build_args[@]}" "$context"
                   for tag in "${tags[@]}"; do
                     docker push "${image}:${tag}"
                   done
@@ -309,7 +323,10 @@ jobs:
                   for tag in "${tags[@]}"; do
                     build_args+=(-t "${image}:${tag}")
                   done
-                  docker build "${build_args[@]}" -f "homepages/Dockerfile.${service}" homepages
+                  docker build \
+                    --cache-from "type=registry,ref=${image}:buildcache" \
+                    --cache-to "type=registry,ref=${image}:buildcache,mode=max" \
+                    "${build_args[@]}" -f "homepages/Dockerfile.${service}" homepages
                   for tag in "${tags[@]}"; do
                     docker push "${image}:${tag}"
                   done
@@ -340,7 +357,10 @@ jobs:
                   for tag in "${tags[@]}"; do
                     build_args+=(-t "${image}:${tag}")
                   done
-                  docker build "${build_args[@]}" "$context"
+                  docker build \
+                    --cache-from "type=registry,ref=${image}:buildcache" \
+                    --cache-to "type=registry,ref=${image}:buildcache,mode=max" \
+                    "${build_args[@]}" "$context"
                   for tag in "${tags[@]}"; do
                     docker push "${image}:${tag}"
                   done
@@ -355,7 +375,7 @@ jobs:
     runs-on: [self-hosted, linux, arch, homelab, prod]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
 
       - name: Apply and roll out userbot panel
         shell: bash