(#51) Linux: git submodule init

Author: ForNeVeR

.github/workflows/main.yml

@@ -22,8 +22,8 @@ jobs:
 
       - name: Checkout
         uses: actions/checkout@v2
-        with:
-          submodules: true
+      - name: Initialize repository submodules
+        run: git submodule init
 
       # Build:
       - name: Install