fix: replace Docker Buildx with plain docker build/push

Buildx requires container networking that fails on TrueNAS runners.
Plain docker build + docker push works without Buildx setup.

.gitea/workflows/release.yml

@@ -160,16 +160,6 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Login to Gitea Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ gitea.server_url }}
-          username: ${{ gitea.actor }}
-          password: ${{ secrets.GITEA_TOKEN }}
-
       - name: Extract version metadata
         id: meta
         run: |
@@ -182,21 +172,37 @@ jobs:
           echo "version=$VERSION" >> "$GITHUB_OUTPUT"
           echo "registry=$REGISTRY" >> "$GITHUB_OUTPUT"
 
-          # Build tag list: version + latest (only for stable releases)
-          TAGS="$REGISTRY:$TAG,$REGISTRY:$VERSION"
-          if ! echo "$TAG" | grep -qE '(alpha|beta|rc)'; then
-            TAGS="$TAGS,$REGISTRY:latest"
-          fi
-          echo "tags=$TAGS" >> "$GITHUB_OUTPUT"
+      - name: Login to Gitea Container Registry
+        run: |
+          echo "${{ secrets.GITEA_TOKEN }}" | docker login \
+            "$(echo '${{ gitea.server_url }}' | sed 's|https\?://||')" \
+            -u "${{ gitea.actor }}" --password-stdin
 
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          context: ./server
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: |
-            org.opencontainers.image.version=${{ steps.meta.outputs.version }}
-            org.opencontainers.image.revision=${{ gitea.sha }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+      - name: Build Docker image
+        run: |
+          TAG="${{ gitea.ref_name }}"
+          REGISTRY="${{ steps.meta.outputs.registry }}"
+
+          docker build \
+            --label "org.opencontainers.image.version=${{ steps.meta.outputs.version }}" \
+            --label "org.opencontainers.image.revision=${{ gitea.sha }}" \
+            -t "$REGISTRY:$TAG" \
+            -t "$REGISTRY:${{ steps.meta.outputs.version }}" \
+            ./server
+
+          # Tag as latest only for stable releases
+          if ! echo "$TAG" | grep -qE '(alpha|beta|rc)'; then
+            docker tag "$REGISTRY:$TAG" "$REGISTRY:latest"
+          fi
+
+      - name: Push Docker image
+        run: |
+          TAG="${{ gitea.ref_name }}"
+          REGISTRY="${{ steps.meta.outputs.registry }}"
+
+          docker push "$REGISTRY:$TAG"
+          docker push "$REGISTRY:${{ steps.meta.outputs.version }}"
+
+          if ! echo "$TAG" | grep -qE '(alpha|beta|rc)'; then
+            docker push "$REGISTRY:latest"
+          fi