make the gcc runners privliged so they can use cap_sys_nice

Author: TrentHouliston

.github/workflows/gcc.yaml

@@ -40,7 +40,9 @@ jobs:
     continue-on-error: true
 
     # Use the container for this specific version of gcc
-    container: ${{ matrix.toolchain.container }}
+    container:
+      image: ${{ matrix.toolchain.container }}
+      options: --privileged
 
     steps:
       - name: Checkout Code