ci: Use xvfb-run in our CI tests

.github/workflows/ci.yml

@@ -354,15 +354,8 @@ jobs:
             share/image-id.txt
           fail-on-cache-miss: true
 
-      - name: Setup xvfb (Linux)
-        run: |
-          # Stuff copied wildly from several stackoverflow posts
-          sudo apt-get install -y xvfb libxkbcommon-x11-0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 libxcb-xinerama0 libxcb-xinput0 libxcb-xfixes0 libxcb-shape0 libglib2.0-0 libgl1-mesa-dev '^libxcb.*-dev' libx11-xcb-dev libglu1-mesa-dev libxrender-dev libxi-dev libxkbcommon-dev libxkbcommon-x11-dev
-
-          # start xvfb in the background
-          sudo /usr/bin/Xvfb $DISPLAY -screen 0 1280x1024x24 &
-
       - name: Run CI tests
         run: |-
-          ./dev_scripts/env.py --distro ${{ matrix.distro }} --version ${{ matrix.version }} run --dev \
+          xvfb-run -s "$DISPLAY -screen 0 1280x1024x24" \
+              ./dev_scripts/env.py --distro ${{ matrix.distro }} --version ${{ matrix.version }} run --dev \
               bash -c 'cd dangerzone; poetry run make test'