push to DH on tag and release

.github/workflows/build-docker.yml

@@ -4,6 +4,7 @@ on:
   workflow_dispatch: # In case a repo contributor needs a specific docker tag built.
   push:
     tags: ['v*.*.*']
+    branches: [main]
   release:
     # Release logic:
     #  https://docs.github.com/en/webhooks/webhook-events-and-payloads?actionType=unpublished#release
@@ -56,7 +57,7 @@ jobs:
         with:
           images: |
             ghcr.io/centrifuge/centrifuge-chain
-            ${{ github.event_name != 'pull_request' && 'centrifugeio/centrifuge-chain' || ''}}
+            ${{ (github.event_name == 'release' || (github.event_name == 'push' && startsWith(github.ref, 'refs/tags/'))) && 'centrifugeio/centrifuge-chain' || ''}}
           # TAGS:
           # v.X.Y.Z when pushing a git tag (or a release)
           # latest when triggered by a release