Use sudo inside dockerised Ubuntu

.github/workflows/build_viewer.yml

@@ -29,7 +29,7 @@ env:
   fallback_platform: ${platform}
   FS_RELEASE_CHAN: ${FS_RELEASE_TYPE}x64
   FS_GRID: "GRID FLAGS NOT SET"
-  PYTHON: 
+  PYTHON: Unknown
 
 jobs:
   build_matrix:
@@ -107,11 +107,11 @@ jobs:
       - name: Install GCC-14
         if: runner.os == 'Linux'
         run: |
-          apt-get update
-          apt-get install -y software-properties-common
-          add-apt-repository -y ppa:ubuntu-toolchain-r/test
-          apt-get update
-          apt-get install -y gcc-14 g++-14
+          sudo apt-get update
+          sudo apt-get install -y software-properties-common
+          sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+          sudo apt-get update
+          sudo apt-get install -y gcc-14 g++-14
           echo "CC=gcc-14"  >> $GITHUB_ENV
           echo "CXX=g++-14" >> $GITHUB_ENV