Add luacheck lint Github action workflow

Author: rbaltrusch

.github/workflows/linter.yaml

@@ -0,0 +1,15 @@
+name: Luacheck
+on:
+- push
+- pull_request
+
+jobs:
+  luacheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Luacheck linter
+        uses: lunarmodules/luacheck@v1
+        with:
+          args: stream.lua