Refactor Docker workflow to conditionally push images based on version tags

- Updated the push condition for Docker builds to only trigger on version tags.
- Removed caching options from Docker build steps for both standard and rootless images.

.gitea/workflows/docker.yml

@@ -61,15 +61,13 @@ jobs:
           context: .
           file: ./docker/Dockerfile
           platforms: linux/amd64,linux/arm64
-          push: ${{ github.event_name != 'pull_request' }}
+          push: ${{ startsWith(github.ref, 'refs/tags/v') }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |
             BUILD_DATE=${{ github.event.head_commit.timestamp }}
             VCS_REF=${{ github.sha }}
             VERSION=${{ steps.meta.outputs.version }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
 
       - name: Extract metadata (tags, labels) for Docker (rootless)
         id: meta_rootless
@@ -89,12 +87,10 @@ jobs:
           context: .
           file: ./docker/Dockerfile.rootless
           platforms: linux/amd64,linux/arm64
-          push: ${{ github.event_name != 'pull_request' }}
+          push: ${{ startsWith(github.ref, 'refs/tags/v') }}
           tags: ${{ steps.meta_rootless.outputs.tags }}
           labels: ${{ steps.meta_rootless.outputs.labels }}
           build-args: |
             BUILD_DATE=${{ github.event.head_commit.timestamp }}
             VCS_REF=${{ github.sha }}
             VERSION=${{ steps.meta_rootless.outputs.version }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max