ci(release): add Docker Hub publish and VirusTotal scan jobs

Docker job builds multi-arch images (amd64/arm64) and pushes to
DockerHub on each tagged release. VirusTotal job scans all release
artifacts and appends results table to release notes.

.github/workflows/release.yml

@@ -27,3 +27,136 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SENTRY_DSN: ${{ secrets.SENTRY_DSN }}
+
+  docker:
+    needs: release
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: torrentclaw/unarr
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=latest
+
+      - uses: docker/setup-qemu-action@v3
+      - uses: docker/setup-buildx-action@v3
+
+      - uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            VERSION=${{ github.ref_name }}
+
+  virustotal:
+    needs: release
+    runs-on: ubuntu-latest
+    if: ${{ secrets.VT_API_KEY != '' }}
+    steps:
+      - name: Get release tag
+        id: tag
+        run: echo "tag=${GITHUB_REF#refs/tags/}" >> "$GITHUB_OUTPUT"
+
+      - name: Download release assets
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          mkdir -p assets
+          gh release download "${{ steps.tag.outputs.tag }}" \
+            --repo "${{ github.repository }}" \
+            --dir assets \
+            --pattern '*.tar.gz' \
+            --pattern '*.zip' \
+            --pattern 'checksums.txt'
+
+      - name: Scan assets with VirusTotal
+        env:
+          VT_API_KEY: ${{ secrets.VT_API_KEY }}
+        run: |
+          mkdir -p results
+          for file in assets/*; do
+            filename=$(basename "$file")
+            echo "Uploading $filename to VirusTotal..."
+
+            response=$(curl -s --request POST \
+              --url https://www.virustotal.com/api/v3/files \
+              --header "x-apikey: $VT_API_KEY" \
+              --form "file=@$file")
+
+            analysis_id=$(echo "$response" | jq -r '.data.id // empty')
+            if [ -z "$analysis_id" ]; then
+              echo "::warning::Failed to upload $filename: $response"
+              continue
+            fi
+
+            echo "$filename=$analysis_id" >> results/scans.txt
+            echo "  Analysis ID: $analysis_id"
+
+            # Rate limit: VT free tier allows 4 req/min
+            sleep 16
+          done
+
+      - name: Wait for analysis completion
+        env:
+          VT_API_KEY: ${{ secrets.VT_API_KEY }}
+        run: |
+          echo "Waiting 60s for VirusTotal analysis to complete..."
+          sleep 60
+
+          vt_report="## 🛡️ VirusTotal Scan Results\n\n"
+          vt_report+="| File | Result | Link |\n"
+          vt_report+="|------|--------|------|\n"
+
+          while IFS='=' read -r filename analysis_id; do
+            result=$(curl -s --request GET \
+              --url "https://www.virustotal.com/api/v3/analyses/$analysis_id" \
+              --header "x-apikey: $VT_API_KEY")
+
+            malicious=$(echo "$result" | jq -r '.data.attributes.stats.malicious // 0')
+            undetected=$(echo "$result" | jq -r '.data.attributes.stats.undetected // 0')
+            sha256=$(echo "$result" | jq -r '.meta.file_info.sha256 // empty')
+
+            if [ "$malicious" = "0" ]; then
+              status="✅ Clean ($undetected engines)"
+            else
+              status="⚠️ $malicious detections"
+            fi
+
+            link="https://www.virustotal.com/gui/file/$sha256"
+            vt_report+="| \`$filename\` | $status | [View]($link) |\n"
+
+            sleep 16
+          done < results/scans.txt
+
+          echo -e "$vt_report" > results/report.md
+          cat results/report.md
+
+      - name: Append scan results to release notes
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          current_body=$(gh release view "${{ steps.tag.outputs.tag }}" \
+            --repo "${{ github.repository }}" \
+            --json body --jq '.body')
+
+          new_body="${current_body}
+
+          $(cat results/report.md)"
+
+          gh release edit "${{ steps.tag.outputs.tag }}" \
+            --repo "${{ github.repository }}" \
+            --notes "$new_body"