Change order of actions

.github/workflows/generate-screenshots.yml

@@ -8,11 +8,12 @@ jobs:
   build:
     runs-on: ubuntu-18.04
     steps:
-      - uses: openrndr/setup-opengl@v1
+      
       - uses: actions/checkout@v2
       - uses: actions/setup-java@v1
         with:
           java-version: 14
+      - uses: openrndr/setup-opengl@v1
       - name: Test glxinfo
         run: |
           echo $LD_LIBRARY_PATH