flatpak test action: trust git repo

Author: NikolasK-source

.github/workflows/flatpak_test.yml

@@ -14,7 +14,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Git config
-      run: git config --global --add safe.directory *
+      run: git config --global --add safe.directory /__w/modbus_tcp_client_shm/modbus_tcp_client_shm
 
     - name: Init submodules
       run: git submodule init