CI: install git and ca-certificates for VCS module fetch

.gitea/workflows/ci.yml

@@ -11,10 +11,10 @@ jobs:
     env:
       GOPROXY: direct
     steps:
-      - name: Install Node.js (required for GitHub Actions)
+      - name: Install system dependencies (Node.js, Git)
         run: |
           apt-get update
-          apt-get install -y nodejs
+          apt-get install -y nodejs git ca-certificates
 
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5