multiple build tags

.github/workflows/ci.yml

@@ -9,6 +9,26 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            samcm/ethereum-metrics-exporter
+          # generate Docker tags based on the following events/attributes
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
       -
         name: Set up QEMU
         uses: docker/setup-qemu-action@v1
@@ -25,5 +45,7 @@ jobs:
         name: Build and push
         uses: docker/build-push-action@v2
         with:
+          context: .
           push: true
-          tags: samcm/ethereum-metrics-exporter:latest
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}