simple gh workflow for tests

.github/workflows/all.yml

@@ -0,0 +1,23 @@
+name: all
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ${{matrix.operating_system}}
+    strategy:
+      fail-fast: false
+      matrix:
+        lua_version: ["luajit", "5.1", "5.4"]
+        operating_system: ["ubuntu-latest", "macos-latest", "windows-latest"]
+    name: "${{matrix.lua_version}}"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup
+        uses: leafo/gh-actions-lua@v11
+        with:
+          luaVersion: ${{matrix.lua_version}}
+      - name: Run
+        run: |
+          lua ./develop/all.lua

.vscode/settings.json

@@ -1,5 +1,5 @@
 {
-    "[json][jsonc][lua][markdown]": {
+    "[json][jsonc][lua][markdown][yaml]": {
         "editor.formatOnSave": true,
         "files.insertFinalNewline": true,
         "files.trimFinalNewlines": true,