adding virtual env instructions for Linux CI

Author: agracio

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ env:
 jobs:
   linux:
     runs-on: ubuntu-latest
-    timeout-minutes: 20
+    timeout-minutes: 10
 
     steps:
     - uses: actions/checkout@v4
@@ -22,12 +22,19 @@ jobs:
           8.0.x
           10.0.x
 
+    - name: Setup virtual environment
+      run: |
+        export DISPLAY=:99
+        echo "DISPLAY=:99" >> $GITHUB_ENV
+        Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
+        sleep 30
+
     - name: Build
       run: ./build.sh
 
   windows:
     runs-on: windows-latest
-    timeout-minutes: 20
+    timeout-minutes: 10
 
     steps:
     - uses: actions/checkout@v4