Run the tests on every push

A Gitea Actions workflow that builds ts3j and the client and runs every
test; none needs a display or the native Opus library.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/test.yml

@@ -0,0 +1,20 @@
+name: test
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 26
+          cache: maven
+      # Builds ts3j from the submodule along with the client; no test needs a display or libopus.
+      - run: mvn -B -f ts3-client/pom.xml verify