Change build action to run on pull requests (#251)

.github/workflows/generate-screenshots.yml

@@ -1,47 +1,56 @@
-name: Generate screenshots
+name: Build and generate screenshots
 on:
   push:
-    branches:
-      - master
+    branches: [ master ]
+
+defaults:
+  run:
+    working-directory: ./orx
 
 jobs:
-  build:
-    runs-on: ubuntu-20.04
+  generate_screenshots:
+    runs-on: ubuntu-latest
     steps:
-      # Get OPENRNDR
-      - name: Get OPENRNDR HEAD ref
-        run: echo "OPENRNDR_HEAD=$(git ls-remote https://github.com/openrndr/openrndr HEAD | awk '{print $1}')" >> $GITHUB_ENV
-      - uses: actions/cache@v2
-        id: cache_openrndr
+      - name: Checkout current repository
+        uses: actions/checkout@v3
         with:
-          path: |
-            ./openrndr
-          key: ${{ runner.os }}--openrndr-${{ env.OPENRNDR_HEAD }}
-      - uses: actions/checkout@v2.3.4
-        #if: steps.cache_openrndr.outputs.cache-hit != 'true'
+          path: ./orx
+
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@v1.0.4
+
+      - name: Checkout OPENRNDR repository
+        uses: actions/checkout@v3
         with:
+          fetch-depth: 1
           repository: openrndr/openrndr
           path: ./openrndr
           ref: master
-      - name: Publish OPENRNDR snapshot
-        run: |
-          cd ./openrndr
-          ./gradlew publishToMavenLocal -Prelease.version=0.5.1-SNAPSHOT
-          cd ..
 
-      - uses: actions/checkout@v2
-      - uses: actions/setup-java@v1
-        with:
-          java-version: 17
       - name: Test glxinfo
         run: |
-          sudo apt install -y mesa-utils xvfb
+          sudo apt-get install -y mesa-utils xvfb
           xvfb-run glxinfo
 
+      - uses: actions/setup-java@v2
+        with:
+          distribution: temurin
+          java-version: 17
+          cache: gradle
+
+      - name: Build OPENRNDR
+        working-directory: ./openrndr
+        run: ./gradlew build -Prelease.version=0.5.1-SNAPSHOT publishToMavenLocal
+
+      - name: Build ORX
+        run: ./gradlew build
+
       - name: Collect screenshots
         run: xvfb-run ./gradlew collectScreenshots
+
       - name: Build main readme
         run: xvfb-run ./gradlew buildMainReadme
+
       - name: Prepare media branch
         run: |
           git config --global user.email "actions@openrndr.org"
@@ -57,4 +66,4 @@ jobs:
           git add [a-z-]*/images/*.png
           cd ..
           git commit -m "add auto-generated media"
-          git push -f origin media
+          git push -f origin media