ci: bootstrap docker cli in runner

.gitea/workflows/package.yml

@@ -42,6 +42,28 @@ jobs:
         with:
           github-server-url: ${{ github.server_url }}
 
+      - name: Ensure Docker CLI is available
+        run: |
+          if command -v docker >/dev/null 2>&1; then
+            docker --version
+            exit 0
+          fi
+
+          if command -v apt-get >/dev/null 2>&1; then
+            apt-get update && apt-get install -y docker.io
+          elif command -v apk >/dev/null 2>&1; then
+            apk add --no-cache docker-cli
+          elif command -v dnf >/dev/null 2>&1; then
+            dnf install -y docker
+          elif command -v yum >/dev/null 2>&1; then
+            yum install -y docker
+          else
+            echo "No supported package manager found to install docker"
+            exit 1
+          fi
+
+          docker --version
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3