GH-4324 Separate out the formatting check into its own action

Signed-off-by: Jerven Bolleman <[email protected]>

.github/workflows/pr-verify.yml

@@ -3,11 +3,11 @@ name: PR verify
 on: pull_request
 
 jobs:
-  build:
+  formatting:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        jdk: [11, 18]
+        jdk: 18
     steps:
     - uses: actions/checkout@v2
     - name: Set up JDK
@@ -23,6 +23,31 @@ jobs:
           ${{ runner.os }}-jdk${{ matrix.jdk }}-maven-
     - name: Check formatting
       run: mvn -B formatter:validate impsort:check xml-format:xml-check
+    - name: Cancel workflow on failure
+      uses: vishnudxb/[email protected]
+      if: failure()
+      with:
+        repo: eclipse/rdf4j
+        workflow_id: ${{ github.run_id }}
+        access_token: ${{ github.token }}
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        jdk: [11, 18]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK
+      uses: actions/setup-java@v1
+      with:
+        java-version: ${{ matrix.jdk }}
+    - name: Cache local Maven repository
+      uses: actions/cache@v2
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-jdk${{ matrix.jdk }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-jdk${{ matrix.jdk }}-maven-
     - name: Build
       run: mvn -B -U -T 2 clean install -Pquick,-formatting -Dmaven.javadoc.skip=true -Djapicmp.skip -Denforcer.skip=true -Danimal.sniffer.skip=true
     - name: Test
@@ -54,8 +79,6 @@ jobs:
         key: ${{ runner.os }}-jdk11-maven-${{ hashFiles('**/pom.xml') }}
         restore-keys: |
           ${{ runner.os }}-jdk11-maven-
-    - name: Check formatting
-      run: mvn -B formatter:validate impsort:check xml-format:xml-check
     - name: Build
       run: mvn -B -U -T 2 clean install -Pquick,-formatting -Dmaven.javadoc.skip=true -Djapicmp.skip -Denforcer.skip=true -Danimal.sniffer.skip=true
     - name: Verify
@@ -87,8 +110,6 @@ jobs:
         key: ${{ runner.os }}-jdk11-maven-${{ hashFiles('**/pom.xml') }}
         restore-keys: |
           ${{ runner.os }}-jdk11-maven-
-    - name: Check formatting
-      run: mvn -B formatter:validate impsort:check xml-format:xml-check
     - name: Build
       run: mvn -B -U -T 2 clean install -Pquick,-formatting -Dmaven.javadoc.skip=true -Djapicmp.skip -Denforcer.skip=true -Danimal.sniffer.skip=true
     - name: Verify