adding work

Author: lemire

.github/workflows/mvnallversions.yml

@@ -0,0 +1,20 @@
+name: maven (11) CI
+
+on: [push,pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDKs 11, 17, 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: |
+            11
+      - name: Build with maven
+        run: mvn build
+      - name: Test with Java 11
+        run: mvn test