fix(build): Use release-please output as tag value input for Docker…

… tagging

There's an issue: the Docker metadata fetching requires a tag push event.
However, release-please doesn't work off tag push events but only (default) branch push events.
(At least that's what all the docs indicate).

The solution is to continue to ignore tag pushes (seems a bit unidiomatic though)
and instead continue to check for created releases and then use the provided output
of the released tag name (*even though it's a branch push event*).

.github/workflows/publish.yml

@@ -85,6 +85,7 @@ jobs:
 
     outputs:
       created: ${{ steps.release.outputs.release_created }}
+      tag_name: ${{ steps.release.outputs.tag_name }}
 
     steps:
       - uses: google-github-actions/release-please-action@v3
@@ -157,9 +158,9 @@ jobs:
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
-            type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-            type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
+            type=semver,value=${{ needs.release-please.outputs.tag_name }},pattern={{version}}
+            type=semver,value=${{ needs.release-please.outputs.tag_name }},pattern={{major}}.{{minor}}
+            type=semver,value=${{ needs.release-please.outputs.tag_name }},pattern={{major}},enable=${{ !startsWith(needs.release-please.outputs.tag_name, 'v0.') }}
 
       - name: Build and push Docker image
         uses: docker/build-push-action@v3