add tags (#22)

Author: cbaker6

.github/workflows/docker-publish.yml

@@ -50,6 +50,10 @@ jobs:
         uses: docker/metadata-action@v3
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
 
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action