adds workflow that creates 'release' tag (along with version tag) when released

Author: jowparks

.github/workflows/docker.yaml

@@ -6,6 +6,8 @@ on:
       - 'master'
     tags:
       - 'v*'
+  release:
+    types: [published]
 
 env:
   REGISTRY: ghcr.io
@@ -30,6 +32,14 @@ jobs:
         uses: docker/metadata-action@v4
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            # For regular pushes to master
+            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/master' }}
+            # For releases
+            type=semver,pattern={{version}},value=${{ github.event.release.tag_name }},enable=${{ github.event_name == 'release' }}
+            type=semver,pattern={{major}}.{{minor}},value=${{ github.event.release.tag_name }},enable=${{ github.event_name == 'release' }}
+            type=raw,value=release,enable=${{ github.event_name == 'release' }}
+            type=sha,format=long
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -41,4 +51,4 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64,linux/arm64