GitHub Actions: moved Error Prone checks to own workflow to reduce build time of CI workflow

.github/workflows/ci.yml

@@ -20,7 +20,6 @@ on:
 
 jobs:
   build:
-    name: build
     runs-on: ubuntu-latest
 
     steps:
@@ -35,10 +34,6 @@ jobs:
           distribution: temurin  # pre-installed on ubuntu-latest
           cache: gradle
 
-      - name: Check with Error Prone
-        if: github.repository == 'JFormDesigner/FlatLaf'
-        run: ./gradlew errorprone clean
-
 
         # test against
         # - Java 8 (minimum requirement)