ci: Build client after commits

.github/workflows/mudclient.yaml

@@ -0,0 +1,28 @@
+on:
+  push:
+    branches:
+     - main
+
+jobs:
+  mudclient:
+    name: Build mudclient.jar
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-java@v4
+      with:
+        distribution: 'temurin'
+        java-version: 8
+
+    - name: Setup Gradle
+      uses: gradle/gradle-build-action@v2
+
+    - name: Run Gradle build
+      run: gradle build
+
+    - name: Upload a Build Artifact
+      uses: actions/upload-artifact@v3
+      with:
+        name: mudclient
+        path: |
+          mudclient/build/libs/*