GitHub action to verify on push (#14)

* Add GitHub action to verify changes to the project.

* switch to maven wrapper in verify action

.github/workflows/verify.yaml

@@ -0,0 +1,19 @@
+name: Verify Project
+
+on:
+  push:
+
+jobs:
+  verify:
+    name: verify
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 21
+        uses: actions/[email protected]
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: maven
+      - name: Verify with Maven
+        run: ./mvnw --batch-mode --update-snapshots package # verify needs gpg key