Switch to using GitHub container registry

Signed-off-by: Marcus Noble <github@marcusnoble.co.uk>

.github/workflows/docker.yaml

@@ -6,66 +6,34 @@ on:
     tags:
       - v*
 
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
 jobs:
-  build:
+  build-and-push-image:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
     steps:
-    - uses: actions/checkout@v2
-
-    - name: Prepare
-      id: prepare
-      run: |
-        DOCKER_IMAGE=averagemarcus/tailscale-exporter
-        DOCKER_PLATFORMS=linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/386,linux/ppc64le,linux/s390x
-
-        VERSION=latest
-        if [[ $GITHUB_REF == refs/tags/* ]]; then
-          VERSION=${GITHUB_REF#refs/tags/}
-        fi
-
-        TAGS="--tag ${DOCKER_IMAGE}:${VERSION}"
-        if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
-          TAGS="$TAGS --tag ${DOCKER_IMAGE}:latest"
-        fi
-
-        echo ::set-output name=tags::${TAGS}
-        echo ::set-output name=platforms::${DOCKER_PLATFORMS}
-
-    - name: Set up Docker Buildx
-      uses: crazy-max/ghaction-docker-buildx@v3
-
-    - name: Cache Docker layers
-      uses: actions/cache@v2
-      id: cache
-      with:
-        path: /tmp/.buildx-cache
-        key: ${{ runner.os }}-buildx-${{ github.sha }}
-        restore-keys: |
-          ${{ runner.os }}-buildx-
-
-    - name: Docker Buildx (build)
-      run: |
-        docker buildx build \
-          --cache-from "type=local,src=/tmp/.buildx-cache" \
-          --cache-to "type=local,dest=/tmp/.buildx-cache" \
-          --platform ${{ steps.prepare.outputs.platforms }} \
-          --output "type=image,push=false" \
-          ${{ steps.prepare.outputs.tags }} \
-          .
-
-    - name: Docker Login
-      env:
-        DOCKER_USERNAME: averagemarcus
-        DOCKER_PASSWORD: ${{ secrets.DOCKER_TOKEN }}
-      run: |
-        echo "${DOCKER_PASSWORD}" | docker login --username "${DOCKER_USERNAME}" --password-stdin
-
-    - name: Docker Buildx (push)
-      run: |
-        docker buildx build \
-          --cache-from "type=local,src=/tmp/.buildx-cache" \
-          --cache-to "type=local,dest=/tmp/.buildx-cache" \
-          --platform ${{ steps.prepare.outputs.platforms }} \
-          --output "type=image,push=true" \
-          ${{ steps.prepare.outputs.tags }} \
-          .
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

README.md

@@ -23,7 +23,7 @@ The following environment variable can be used to configure the exporter:
 ```shell
 export TAILSCALE_API_KEY="my-tailscale-api-key"
 export TAILSCALE_TAILNET="my-tailnet.github"
-docker run --rm -it -p 8080:8080 -e TAILSCALE_API_KEY -e TAILSCALE_TAILNET averagemarcus/tailscale-exporter:latest
+docker run --rm -it -p 8080:8080 -e TAILSCALE_API_KEY -e TAILSCALE_TAILNET ghcr.io/averagemarcus/tailscale-exporter:latest
 ```
 
 Then visit: [http://localhost:8080/metrics](http://localhost:8080/metrics)
@@ -76,7 +76,7 @@ spec:
     spec:
       containers:
       - name: tailscale-exporter
-        image: averagemarcus/tailscale-exporter:latest
+        image: ghcr.io/averagemarcus/tailscale-exporter:latest
         imagePullPolicy: Always
         ports:
         - containerPort: 8080