GitHub Actions: build using various Java versions and publish snapshot in single job to reduce overhead

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ on:
 
 jobs:
   build:
-    name: build (11)
+    name: build
     runs-on: ubuntu-latest
 
     steps:
@@ -39,10 +39,35 @@ jobs:
         if: github.repository == 'JFormDesigner/FlatLaf'
         run: ./gradlew errorprone clean
 
-      - name: Build with Gradle
+
+        # test against
+        # - Java 8 (minimum requirement)
+        # - Java LTS versions (11, 17, ...)
+        # - latest Java version(s)
+
+      - name: Build with Java 8
+        if: github.repository == 'JFormDesigner/FlatLaf'
+        run: ./gradlew build clean -Dtoolchain=8
+
+      - name: Build with Java 17 LTS
+        if: github.repository == 'JFormDesigner/FlatLaf'
+        run: ./gradlew build clean -Dtoolchain=17
+
+      - name: Build with Java 21 LTS
+        if: github.repository == 'JFormDesigner/FlatLaf'
+        run: ./gradlew build clean -Dtoolchain=21
+
+      - name: Build with Java 25 LTS
+        if: github.repository == 'JFormDesigner/FlatLaf'
+        run: ./gradlew build clean -Dtoolchain=25
+
+
+      # build with Java 11 for snapshot
+
+      - name: Build with Java 11 LTS
         run: ./gradlew build
 
-      - name: Upload artifacts
+      - name: Upload artifacts to GitHub Actions
         uses: actions/upload-artifact@v4
         with:
           name: FlatLaf-build-artifacts
@@ -53,56 +78,11 @@ jobs:
             !**/*-sources.jar
 
 
-  build-on:
-    runs-on: ubuntu-latest
-    needs: build
-    if: github.repository == 'JFormDesigner/FlatLaf'
-
-    strategy:
-      matrix:
-        # test against
-        # - Java 8 (minimum requirement)
-        # - Java LTS versions (11, 17, ...)
-        # - latest Java version(s)
-        java:
-          - 8
-          - 17  # LTS
-          - 21  # LTS
-          - 25  # LTS
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Setup Java 11
-        uses: actions/setup-java@v4
-        with:
-          java-version: 11
-          distribution: temurin  # pre-installed on ubuntu-latest
-          cache: gradle
-
-      - name: Build with Gradle
-        run: ./gradlew build -Dtoolchain=${{ matrix.java }}
-
-
-  snapshot:
-    runs-on: ubuntu-latest
-    needs: build-on
-    if: |
-      github.event_name == 'push' &&
-      (github.ref == 'refs/heads/main' || startsWith( github.ref, 'refs/heads/develop-' )) &&
-      github.repository == 'JFormDesigner/FlatLaf'
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Setup Java 11
-        uses: actions/setup-java@v4
-        with:
-          java-version: 11
-          distribution: temurin  # pre-installed on ubuntu-latest
-          cache: gradle
-
       - name: Publish snapshot to Sonatype Central
+        if: |
+          github.repository == 'JFormDesigner/FlatLaf' &&
+          github.event_name == 'push' &&
+          (github.ref == 'refs/heads/main' || startsWith( github.ref, 'refs/heads/develop-' ))
         run: ./gradlew publish -PskipFonts -Dorg.gradle.internal.publish.checksums.insecure=true -Dorg.gradle.parallel=false
         env:
           SONATYPE_USERNAME: ${{ secrets.SONATYPE_USERNAME }}
@@ -111,7 +91,7 @@ jobs:
 
   release:
     runs-on: ubuntu-latest
-    needs: build-on
+    needs: build
     if: |
       github.event_name == 'push' &&
       startsWith( github.ref, 'refs/tags/' ) &&