ci: add git bootstrap for runner

.gitea/workflows/package.yml

@@ -12,6 +12,28 @@ jobs:
       contents: read
 
     steps:
+      - name: Ensure Git is available
+        run: |
+          if command -v git >/dev/null 2>&1; then
+            git --version
+            exit 0
+          fi
+
+          if command -v apt-get >/dev/null 2>&1; then
+            apt-get update && apt-get install -y git
+          elif command -v apk >/dev/null 2>&1; then
+            apk add --no-cache git
+          elif command -v dnf >/dev/null 2>&1; then
+            dnf install -y git
+          elif command -v yum >/dev/null 2>&1; then
+            yum install -y git
+          else
+            echo "No supported package manager found to install git"
+            exit 1
+          fi
+
+          git --version
+
       - name: Checkout code
         uses: actions/checkout@v4
         with: