chore: Add luacheck linter project configuration

.luacheckrc

@@ -0,0 +1,31 @@
+unused_args     = false
+redefined       = false
+max_line_length = false
+
+not_globals = {
+    "string.len",
+    "table.getn",
+}
+
+include_files = {
+  "**/*.lua",
+  "**/*.rockspec",
+  ".busted",
+  ".luacheckrc",
+}
+
+exclude_files = {
+    "etc/*.lua",
+    "etc/**/*.lua",
+    "test/*.lua",
+    "test/**/*.lua",
+    "samples/*.lua",
+    "samples/**/*.lua",
+    "gem/*.lua",
+    "gem/**/*.lua",
+    -- GH Actions Lua Environment
+    ".lua",
+    ".luarocks",
+    ".install",
+}
+