Replace builds.sr.ht with GitHub action

.build.yml

@@ -1,9 +0,0 @@
-image: alpine/edge
-packages:
-  - luacheck
-sources:
-  - https://github.com/vicious-widgets/vicious
-tasks:
-  - check: |
-      cd vicious
-      luacheck --config=tools/luacheckrc .

.github/workflows/luacheck.yml

@@ -0,0 +1,14 @@
+name: luacheck
+on:
+  - pull_request
+  - push
+jobs:
+  luacheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+      - name: lint
+        uses: lunarmodules/luacheck@v1
+        with:
+          args: --config=tools/luacheckrc .