fix: improve Docker image tagging strategy for releases (#70)

- Remove PR-specific tagging to reduce unnecessary image builds
- Add semantic versioning tags (major, minor, patch) for releases
- Restrict 'latest' tag to only releases instead of main branch pushes
- Add version-specific tags only when releases are published

Author: hrntknr

.github/workflows/docker-build.yaml

@@ -40,9 +40,11 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
             type=ref,event=branch
-            type=ref,event=pr,prefix=pr-
             type=ref,event=tag
-            type=raw,value=latest,enable={{is_default_branch}}
+            type=semver,pattern={{version}},enable=${{ github.event_name == 'release' && github.event.action == 'published' }}
+            type=semver,pattern={{major}}.{{minor}},enable=${{ github.event_name == 'release' && github.event.action == 'published' }}
+            type=semver,pattern={{major}},enable=${{ github.event_name == 'release' && github.event.action == 'published' }}
+            type=raw,value=latest,enable=${{ github.event_name == 'release' && github.event.action == 'published' }}
 
       - name: Build and push Docker image
         id: build-and-push