setup zulu with javafx using olafurpg/setup-scala action (sbt#1637)

* use "Set up Azul JDK 1.8 and SBT" in scripted-jdk-packager job

* use custom url

.github/workflows/validate-pr.yml

@@ -183,14 +183,11 @@ jobs:
         key: ${{ runner.os }}-ivy-${{ hashFiles('**/*.sbt') }}
         restore-keys: |
           ${{ runner.os }}-ivy-
-    - name: Download JDK 1.8
-      run: wget -O zulu-jdk.tar.gz https://cdn.azul.com/zulu/bin/zulu8.38.0.13-ca-fx-jdk8.0.212-linux_x64.tar.gz
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - name: Set up Azul JDK 1.8 and SBT
+      uses: olafurpg/setup-scala@v10
       with:
-        java-version: 1.8
         # the standard zulu dist doesn't include javafx
-        jdkFile: 'zulu-jdk.tar.gz'
+        java-version: zulu@1.8=tgz+https://cdn.azul.com/zulu/bin/zulu8.38.0.13-ca-fx-jdk8.0.212-linux_x64.tar.gz
     - name: Validate
       run: sbt "^validateJdkPackagerTravis"