Attempt to generate screenshots in actions

.github/workflows/generate-screenshots.yml

@@ -0,0 +1,25 @@
+name: Generate screenshots
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-bionic
+    steps:
+      - uses: openrndr/setup-opengl@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 14
+      - name: Collect screenshots
+        run: xvfb-run ./gradlew collectScreenshots
+      - uses: stefanzweifel/git-auto-commit-action@v4.1.5
+        with:
+          commit_message: Add generated screenshots
+          file_pattern: "**/*.png"
+          repository: .
+          commit_user_name: edwinRNDR
+          commit_user_email: edwin@rndr.studio
+          commit_author: edwinRNDR <edwin@rndr.studio>