Use git_cli option for buildpkg and remove StrictHostKeyChecking

Force buildpkg to use CLI git instead of LibGit2 to work with
our SSH configuration

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Keno

.github/workflows/CI.yml

@@ -41,10 +41,10 @@ jobs:
           chmod 600 ~/.ssh/deploy_key
           
           # Configure git to use the deploy key
-          git config --global core.sshCommand "ssh -i ~/.ssh/deploy_key -o StrictHostKeyChecking=no"
+          git config --global core.sshCommand "ssh -i ~/.ssh/deploy_key"
       - uses: julia-actions/julia-buildpkg@v1
-        env:
-          JULIA_PKG_USE_CLI_GIT: "true"
+        with:
+          git_cli: true
       - uses: julia-actions/julia-runtest@v1
         env:
           JULIA_PKG_USE_CLI_GIT: "true"