chore(CI): Update CI configs (cryostatio#183)

.github/workflows/check-labels.yml

@@ -0,0 +1,17 @@
+name: Check labels not applied
+
+on:
+  pull_request:
+    types:
+      - opened
+      - labeled
+      - unlabeled
+      - synchronize
+
+jobs:
+  check-needs-triage-not-applied:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fail if needs-triage label applied
+        if: ${{ contains(github.event.pull_request.labels.*.name, 'needs-triage')}}
+        run: exit 1

.github/workflows/ci.yaml

@@ -27,6 +27,9 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        JVM_version: ['11', '17']
     if: ${{ github.repository_owner == 'cryostatio' }}
     steps:
     - name: Fail if PR and safe-to-test label NOT applied
@@ -39,7 +42,7 @@ jobs:
         submodules: true
     - uses: actions/setup-java@v2
       with:
-        java-version: '11'
+        java-version: ${{ matrix.JVM_version }}
         distribution: 'temurin'
     - name: maven-settings
       uses: s4u/maven-settings-action@v2

.github/workflows/labeler.yml

@@ -0,0 +1,18 @@
+name: Label pull request
+
+on:
+  pull_request_target:
+    types: 
+      - opened
+      - reopened
+
+jobs:
+  triage:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v4
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"