Fix in docs; test 5 - from https://discourse.julialang.org/t/ci-fails…

…-to-build-glmakie-dependency/80125/2

.github/workflows/CI.yml

@@ -83,18 +83,18 @@ jobs:
       - uses: julia-actions/setup-julia@v1
         with:
           version: '1'
-      - name: Install and Run xvfb
+      - name: Prepare env for xvfb
         run: |
-          sudo apt-get install -y xvfb
-          xvfb-run -s '-screen 0 1024x768x24'
+          sudo apt-get update
+          sudo apt-get install -y xorg-dev mesa-utils xvfb libgl1 freeglut3-dev libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev libxext-dev
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-docdeploy@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Install xvfb
         run: sudo apt-get install -y xvfb
       - run: |
-          julia --project=docs -e '
+          DISPLAY=:0 xvfb-run -s '-screen 0 1024x768x24' julia --project=docs -e '
             using Documenter: DocMeta, doctest
             using GalerkinToolkit
             DocMeta.setdocmeta!(GalerkinToolkit, :DocTestSetup, :(using GalerkinToolkit); recursive=true)