also test with latest minetest version

.github/workflows/integration-test-latest.yml

@@ -0,0 +1,14 @@
+name: integration-test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: test
+      run: MINETEST_VERSION=latest ./integration-test.sh

.github/workflows/integration-test.yml

@@ -11,4 +11,4 @@ jobs:
     - uses: actions/checkout@v1
 
     - name: test
-      run: ./integration-test.sh
+      run: MINETEST_VERSION=5.2.0 ./integration-test.sh

integration-test.sh

@@ -21,6 +21,6 @@ docker run --rm -i \
 	-v ${CFG}:/etc/minetest/minetest.conf:ro \
 	-v ${MTDIR}:/var/lib/minetest/.minetest \
 	-v $(pwd):/var/lib/minetest/.minetest/worlds/world/worldmods/technic \
-	registry.gitlab.com/minetest/minetest/server:5.2.0
+	registry.gitlab.com/minetest/minetest/server:${MINETEST_VERSION}
 
 test -f ${WORLDDIR}/integration_test.json && exit 0 || exit 1