Automate release

Signed-off-by: Hidde Beydals <hello@hidde.co>

Author: hiddeco

.github/workflows/build.yaml

@@ -5,7 +5,13 @@ on:
     branches:
       - main
       - dev
+    tags:
+      - '**'
+    paths-ignore:
+      - README.md
   pull_request:
+    paths-ignore:
+      - README.md
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -41,19 +47,68 @@ jobs:
           echo "Status:    ${{ steps.buildx.outputs.status }}"
           echo "Flags:     ${{ steps.buildx.outputs.flags }}"
           echo "Platforms: ${{ steps.buildx.outputs.platforms }}"
-      - name: Build candidate
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        id: cache
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-ghcache-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-ghcache-
+      - name: Build candidate image
         id: build_candidate
         uses: docker/build-push-action@v2
         with:
           context: .
           file: Dockerfile
           platforms: ${{ env.PLATFORMS }}
           push: true
-          tags: localhost:5000/golang-with-libgit2:latest
-      - name: Inspect candidate
+          tags: localhost:5000/${{ github.repository_owner }}/golang-with-libgit2:latest
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
+      - name: Inspect candidate image
         run: |
-          docker buildx imagetools inspect localhost:5000/golang-with-libgit2:latest
-      - name: Test candidate
+          docker buildx imagetools inspect localhost:5000/${{ github.repository_owner }}/golang-with-libgit2:latest
+      - name: Test candidate image
         id: test_candidate
         run: |
-          IMG=localhost:5000/golang-with-libgit2 make test
+          IMG=localhost:5000/${{ github.repository_owner }}/golang-with-libgit2 make test
+      - # Temp fix
+        # https://github.com/docker/build-push-action/issues/252
+        # https://github.com/moby/buildkit/issues/1896
+        name: Move cache
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache
+      - name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Compose release candidate metadata
+        id: meta
+        uses: docker/metadata-action@v3
+        if: github.event_name != 'pull_request'
+        with:
+          images: |
+            ghcr.io/${{ github.repository_owner }}/golang-with-libgit2
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=tag
+            type=sha
+            type=sha,format=long
+      - name: Release candidate image
+        id: release_candidate
+        if: github.event_name != 'pull_request'
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: Dockerfile
+          platforms: ${{ env.PLATFORMS }}
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=local,src=/tmp/.buildx-cache