Only build Docker images on GitHub Release

Author: KirovAir

.github/workflows/build-and-deploy.yml

@@ -9,7 +9,6 @@ on:
       - master
   release:
     types: [published]
-  workflow_dispatch:
 
 env:
   REGISTRY: ghcr.io
@@ -35,7 +34,7 @@ jobs:
 
   docker:
     needs: test
-    if: github.event_name != 'pull_request'
+    if: github.event_name == 'release'
     runs-on: ubuntu-latest
     permissions:
       contents: read