implement xvfb, remove headed tests

Author: ben-c-at-moz

.github/workflows/smoke.yml

@@ -261,23 +261,14 @@ jobs:
           #. ./keyring-unlock.sh;
       - name: Run Smoke Tests in Ubuntu
         if: steps.setup.conclusion == 'success'
+        uses: coactions/setup-xvfb@v1
         env:
           FX_EXECUTABLE: ./firefox/firefox
         run: |
           "$FX_EXECUTABLE" --version
           pipenv run python choose_ci_set.py
           pipenv run pytest --fx-executable="$FX_EXECUTABLE" -n 4 $(cat selected_tests) || TEST_EXIT_CODE=$?
           exit $TEST_EXIT_CODE
-      - name: Run Smoke Tests in Ubuntu (Headed)
-        if: steps.setup.conclusion == 'success' && always()
-        env:
-          FX_EXECUTABLE: ./firefox/firefox
-          REPORTABLE: true
-        run: |
-          mv ./ci_pyproject_headed.toml ./pyproject.toml;
-          pipenv run python choose_ci_set.py
-          pipenv run pytest --fx-executable="$FX_EXECUTABLE" $(cat selected_tests) || TEST_EXIT_CODE=$?
-          exit $TEST_EXIT_CODE
 
   Use-Artifacts:
     runs-on: ubuntu-latest