Add unit tests actions workflow

Author: jsoberg

.github/workflows/run-unit-tests.yml

@@ -0,0 +1,29 @@
+# Runs all unit tests in the project
+name: "Run Unit Tests"
+
+on:
+  # Automatically run on pushes directly to main.
+  push:
+    branches: [ main ]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'adopt'
+          java-version: '21'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Run all unit tests
+        run: ./gradlew test