Merge pull request #19 from TheMeier/gha

chore: add github action to publish versioned docker images to ghcr.io

Author: kic68

.github/workflows/ci.yaml

@@ -1,10 +1,12 @@
 name: CI
 
 on:
-  push:
-    branches: [ master ]
   pull_request:
 
+permissions:
+  contents: read
+  packages: write
+
 jobs:
   docker-build-push:
     runs-on: ubuntu-latest
@@ -16,8 +18,9 @@ jobs:
         with:
           registry: ghcr.io
           username: ${{github.actor}}
-          password: ${{secrets.GITHUB_TOKEN}}        
-      - name: 'Build Inventory Image'
+          password: ${{github.token}}
+      - name: 'Build and Push Image'
         run: |
-          docker build . --tag ghcr.io/$GITHUB_REPOSITORY_OWNER/downdetector-exporter:latest
-          docker push ghcr.io/$GITHUB_REPOSITORY_OWNER/downdetector-exporter:latest
+          IMAGE_NAMESPACE=$(echo "$GITHUB_ACTOR" | tr '[:upper:]' '[:lower:]')
+          docker build . --tag ghcr.io/${IMAGE_NAMESPACE}/downdetector-exporter:latest
+          docker push ghcr.io/${IMAGE_NAMESPACE}/downdetector-exporter:latest

.github/workflows/release.yaml

@@ -0,0 +1,48 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - '*'
+
+permissions:
+  contents: write
+  packages: write
+
+jobs:
+  docker-build-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: 'Pull Code'
+        uses: actions/checkout@main
+
+      - name: 'Login to GitHub Container Registry'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      - name: 'Build and Push Image'
+        run: |
+          IMAGE_NAMESPACE=$(echo "$GITHUB_REPOSITORY_OWNER" | tr '[:upper:]' '[:lower:]')
+          docker build \
+            --build-arg VERSION=${{ github.ref_name }} \
+            --tag ghcr.io/${IMAGE_NAMESPACE}/downdetector-exporter:${{ github.ref_name }} \
+            --tag ghcr.io/${IMAGE_NAMESPACE}/downdetector-exporter:latest \
+            .
+          docker push ghcr.io/${IMAGE_NAMESPACE}/downdetector-exporter:${{ github.ref_name }}
+          docker push ghcr.io/${IMAGE_NAMESPACE}/downdetector-exporter:latest
+  release:
+    runs-on: ubuntu-latest
+    needs: docker-build-push
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@main
+        with:
+          fetch-depth: 0
+      - name: Create Release Page
+        shell: bash
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: gh release create ${{ github.ref_name }} --generate-notes

Dockerfile

@@ -6,7 +6,9 @@ COPY go.mod go.sum ./
 RUN go mod download
 
 COPY *.go ./
-RUN CGO_ENABLED=0 GOOS=linux go build -o /downdetector-exporter
+
+ARG VERSION=dev
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags "-X main.version=${VERSION}" -o /downdetector-exporter
 
 FROM gcr.io/distroless/base-debian13 AS build-release-stage
 

downdetector-exporter.go

@@ -33,7 +33,9 @@ const (
 )
 
 var (
-	lg = log.NewLogfmtLogger(os.Stdout)
+	// version is set via ldflags during build
+	version = "dev"
+	lg      = log.NewLogfmtLogger(os.Stdout)
 
 	// fields for metrics request. If expanded, struct CompanySet needs to be expanded accordingly
 	fieldsToReturn       = []string{"id", "name", "slug", "baseline_current", "country_iso", "stats_24", "stats_60", "status"}
@@ -156,6 +158,12 @@ func main() {
 
 	// TODO: - value checking
 	// app is a command line parser
+	cli.VersionFlag = &cli.BoolFlag{
+		Name:    "version",
+		Aliases: []string{"V"},
+		Usage:   "print version information and exit",
+	}
+
 	app := &cli.App{
 		Authors: []*cli.Author{
 			{
@@ -166,6 +174,7 @@ func main() {
 		Commands:  nil,
 		ArgsUsage: " ",
 		Name:      "downdetector-exporter",
+		Version:   version,
 		Usage:     "report metrics of downdetector api",
 		Flags: []cli.Flag{
 			&cli.StringFlag{