Fix linux build action [ci build]

actions/runner-images#323

.github/workflows/linux-ci.yml

@@ -28,7 +28,9 @@ jobs:
     - name: Create Build Environment
       # Some projects don't allow in-source building, so create a separate build directory
       # We'll use this as our working directory for all subsequent commands
-      run: tools/travis-scripts/before-install.sh
+      run: |
+        for apt_file in `grep -lr microsoft /etc/apt/sources.list.d/`; do sudo rm $apt_file; done
+        tools/travis-scripts/before-install.sh
 
     - name: Build
       # Execute the build.  You can specify a specific target with "--target <NAME>"