Try adding workflow

.github/workflows/test.yml

@@ -0,0 +1,31 @@
+# Copied from https://github.com/mt-mods/dreambuilder_game
+
+name: test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    strategy:
+      matrix:
+        ENGINE_IMAGE:
+          - registry.gitlab.com/minetest/minetest/server:5.7.0
+          - ghcr.io/minetest-hosting/minetest-docker:5.8.0
+          - ""
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+        submodules: recursive
+
+    - uses: actions/checkout@v4
+      with:
+        repository: minetest/minetest_game
+        ref: "5.7.0"
+        path: .REPOS/minetest_game
+
+    - name: test
+      run: docker-compose up --exit-code-from testserver

docker-compose.yml

@@ -0,0 +1,15 @@
+# Copied from https://github.com/mt-mods/dreambuilder_game
+
+version: "3.6"
+
+services:
+  test:
+    image: ${ENGINE_IMAGE:-ghcr.io/minetest-hosting/minetest-docker:main}
+
+    entrypoint: "minetestserver --config /minetest.conf"
+      user: root
+      volumes:
+        - "./:/root/.minetest/mods/bls_mods/"
+        - "./world.mt:/root/.minetest/worlds/world/world.mt"
+        - "./minetest.conf:/root/.minetest/minetest.conf"
+        - "./.REPOS/minetest_game/:/root/.minetest/games/minetest_game/"