[rust] Setup Xvfb always in Linux worker

Author: bonigarcia

.bazelrc

@@ -82,7 +82,7 @@ build --test_output=errors
 
 test --test_env=CI
 test --test_env=DASHBOARD_URL
-test --test_env=DISPLAY=":1"
+test --test_env=DISPLAY
 test --test_env=FIREFOX_NIGHTLY_BINARY
 test --test_env=GITHUB_ACTIONS
 test --test_env=MOZ_HEADLESS

.github/workflows/bazel.yml

@@ -145,7 +145,7 @@ jobs:
         with:
           bazelrc: common --color=yes
       - name: Setup Fluxbox and Xvfb
-        if: inputs.os == 'ubuntu' && inputs.browser != ''
+        if: inputs.os == 'ubuntu'
         run: |
           sudo apt-get -y install fluxbox
           Xvfb :99 &