add mtt support

.github/workflows/test.yml

@@ -0,0 +1,15 @@
+name: test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: buckaroobanzay/mtt@main
+      with:
+        modname: playerfactions
+        git_dependencies: |
+          https://github.com/minetest-mods/areas.git