Update workflow to JDK24 and move spotless into a separate step

Author: Martin7-1

.github/workflows/main.yaml

@@ -29,15 +29,15 @@ jobs:
         java_version:
           - 17
           - 21
-          - 23
+          - 24
         include:
           - java_version: '17'
             mvn_opts: '-Dtinylog.writer.level=info'
             experimental: false
           - java_version: '21'
             mvn_opts: '-Dtinylog.writer.level=info'
             experimental: false
-          - java_version: '23'
+          - java_version: '24'
             mvn_opts: '-Dtinylog.writer.level=info'
             experimental: true
     runs-on: ubuntu-latest
@@ -94,3 +94,16 @@ jobs:
         # Check we only rely on permissive licenses in the main parts of the library:
       - name: License Compliance
         run: mvn -P compliance org.honton.chas:license-maven-plugin:compliance
+
+  spotless:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+          cache: 'maven'
+      - name: Spotless Check
+        run: mvn -Pspotless validate

.github/workflows/release.yaml

@@ -26,7 +26,6 @@ jobs:
       - name: release
         run: |
           mvn -B -U --fail-at-end \
-            -Dspotless.check.skip=true \
             -DskipTests -DskipITs -Psign \
             clean deploy
         env: