Fix git not working.

Should fix Nightly builds looping over and over again on update checking when "Use nightly versions" is enabled.

.github/workflows/build.yml

@@ -29,6 +29,8 @@ jobs:
         uses: actions/checkout@v1
         with:
           submodules: recursive
+      - name: Setup environment
+        run: git config --global safe.directory '*'
       - name: Install tools
         run: |
           sudo apt-get update