ci: make Git less picky in the newer ubuntu-docker-musl image

.github/workflows/tools_ci.yml

@@ -111,6 +111,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Build V
         run: make -j4 && ./v -cg -o v cmd/v
+      - name: Ensure git commands can be used with no prompts on modern Git versions
+        run: git config --global --add safe.directory /__w/v/v
       - name: Verify `v test` works
         run: |
           ./v cmd/tools/test_if_v_test_system_works.v