feat: init command, README, fix config creation, move cicd

- cmd_init.go: interactive setup wizard (gosleep-timer init)
- README.md: comprehensive documentation
- config/config.go: fix os.IsNotExist → errors.Is for wrapped err
- main.go: remove '(no TUI)' from run help
- cicd.yaml moved to .github/workflows/cicd.yaml

.github/workflows/cicd.yaml

@@ -0,0 +1,141 @@
+name: ci
+
+'on':
+  push:
+    branches:
+      - '**'
+  pull_request:
+  workflow_dispatch:
+
+env:
+  REGISTRY: gcr.forust.xyz
+  IMAGE_NAME: forust/gosleep-timer
+
+jobs:
+  lint-go:
+    runs-on: [self-hosted, linux, arch, homelab]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - name: Lint with golangci-lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: latest
+          args: --config .golangci.yml --timeout 10m
+
+      - name: Run staticcheck
+        shell: bash
+        run: |
+          go install honnef.co/go/tools/cmd/staticcheck@latest
+          staticcheck ./...
+
+      - name: Run gosec
+        shell: bash
+        run: |
+          go install github.com/securego/gosec/v2/cmd/gosec@latest
+          gosec -no-fail -fmt=text ./...
+
+      - name: Run revive
+        shell: bash
+        run: |
+          go install github.com/mgechev/revive@latest
+          revive -config .revive.toml ./...
+
+  lint-yaml:
+    runs-on: [self-hosted, linux, arch, homelab]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Lint YAML syntax
+        shell: bash
+        run: |
+          docker run --rm \
+            -v "$PWD:/work" \
+            -w /work \
+            cytopia/yamllint:latest \
+            -c .yamllint .
+
+  build:
+    runs-on: [self-hosted, linux, arch, homelab]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - name: Build
+        shell: bash
+        run: go build -ldflags="-s -w" -o gosleep-timer .
+
+      - name: Test
+        shell: bash
+        run: go test -v -race -coverprofile=cover.out ./...
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: gosleep-timer
+          path: gosleep-timer
+
+  publish:
+    needs: [lint-go, lint-yaml, build]
+    if: github.event_name != 'pull_request' && (github.ref_name == 'main' || github.ref_name == 'dev')
+    runs-on: [self-hosted, linux, arch, homelab]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - name: Read project version
+        id: version
+        shell: bash
+        run: |
+          version="$(go version -m 2>/dev/null || date +%Y%m%d)"
+          echo "version=$version" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to registry
+        shell: bash
+        run: |
+          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login "${REGISTRY}" \
+            -u "${{ secrets.REGISTRY_USERNAME }}" \
+            --password-stdin
+
+      - name: Build and push image
+        shell: bash
+        run: |
+          image="${REGISTRY}/${IMAGE_NAME}"
+          tags=("latest" "${{ steps.version.outputs.version }}")
+
+          case "${GITHUB_REF_NAME}" in
+            main)
+              tags+=("main" "prod")
+              ;;
+            dev)
+              tags+=("dev")
+              ;;
+          esac
+
+          build_args=()
+          for tag in "${tags[@]}"; do
+            build_args+=(-t "${image}:${tag}")
+          done
+
+          docker build "${build_args[@]}" .
+
+          for tag in "${tags[@]}"; do
+            docker push "${image}:${tag}"
+          done