Setup luacheck

Currently runs clean.

.github/workflows/luacheck.yml

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+name: Linting
+
+on: [push, pull_request]
+
+jobs:
+  luacheck:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Setup Lua
+      uses: leafo/gh-actions-lua@v8
+      with:
+        luaVersion: 5.4
+    - name: Setup Lua Rocks
+      uses: leafo/gh-actions-luarocks@v4
+    - name: Setup luacheck
+      run: luarocks install luacheck
+    - name: Run Code Linter
+      run: |
+        luacheck .

.luacheckrc

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+-- love uses luajit with some extras (unpack) from 5.2
+std = "love+luajit+lua52"
+
+-- These are acceptable to me, but not currently necessary.
+--~ max_line_length    = false -- Do not limit line length.
+--~ unused_secondaries = false -- Filter out warnings related to unused variables set together with used ones.
+
+exclude_files = {
+    -- leafo/gh-actions-lua & luarocks put lua files here
+    '.install',
+    '.lua',
+    '.luarocks',
+}
+
+-- vim:set et sw=4 ts=4 ft=lua: