⚙️ .github: use docker's actions

.github/workflows/build-image.yml

@@ -4,7 +4,6 @@ on: [push, workflow_dispatch]
 
 env:
   ENDPOINT: "neingeist/docker-mod-openssh-server-tweaks"
-  BRANCH: "master"
 
 jobs:
   build:
@@ -12,24 +11,35 @@ jobs:
     permissions:
       packages: write
     steps:
-      - uses: actions/checkout@v3
+      - name: Checkout
+        uses: actions/checkout@v3
 
-      - name: Build image
-        run: |
-          docker build --no-cache -t ${{ github.sha }} .
-      - name: Tag image
-        if: ${{ github.ref == format('refs/heads/{0}', env.BRANCH) && env.ENDPOINT != 'user/endpoint' }}
-        run: |
-          docker tag ${{ github.sha }} ${ENDPOINT}
-          docker tag ${{ github.sha }} ${ENDPOINT}:${{ github.sha }}
-          docker tag ${{ github.sha }} ghcr.io/${ENDPOINT}
-          docker tag ${{ github.sha }} ghcr.io/${ENDPOINT}:${{ github.sha }}
-      - name: Login to GitHub Container Registry
-        if: ${{ github.ref == format('refs/heads/{0}', env.BRANCH) && env.ENDPOINT != 'user/endpoint' }}
-        run: |
-          echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
-      - name: Push tags to GitHub Container Registry
-        if: ${{ github.ref == format('refs/heads/{0}', env.BRANCH) && env.ENDPOINT != 'user/endpoint' }}
-        run: |
-          docker push ghcr.io/${ENDPOINT}:${{ github.sha }}
-          docker push ghcr.io/${ENDPOINT}
+      -
+        name: Docker - Meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ghcr.io/${{ env.ENDPOINT }}
+          tags: |
+            type=sha,prefix=,format=short,enable=true
+            type=ref,event=branch
+            # set latest tag for default branch
+            type=raw,value=latest,enable={{is_default_branch}}
+      -
+        name: Docker - Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Docker - Login to GitHub Container Registry
+        if: github.ref_type == 'branch'
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      -
+        name: Docker - Build and push
+        uses: docker/build-push-action@v3
+        with:
+          push: ${{ github.ref_type == 'branch' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}