Fix: Add robust Docker CLI installation to Gitea workflow using static binaries

.github/workflows/docker-build.yml

@@ -15,6 +15,30 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Install Docker CLI
+        run: |
+          if ! command -v docker >/dev/null 2>&1; then
+            echo "Docker CLI not found. Installing static binary..."
+            if command -v curl >/dev/null 2>&1; then
+              curl -fsSL https://download.docker.com/linux/static/stable/x86_64/docker-26.1.4.tgz | tar -xz -C /usr/local/bin --strip-components=1 docker/docker
+            elif command -v wget >/dev/null 2>&1; then
+              wget -qO- https://download.docker.com/linux/static/stable/x86_64/docker-26.1.4.tgz | tar -xz -C /usr/local/bin --strip-components=1 docker/docker
+            else
+              echo "Neither curl nor wget found! Attempting package manager install..."
+              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
+              else
+                echo "Cannot install Docker CLI!"
+                exit 1
+              fi
+            fi
+          else
+            echo "Docker CLI already installed."
+          fi
+          docker --version
+
       - name: Log in to GitHub Container Registry
         uses: docker/login-action@v3
         with: