lua: add withPackages function (#54460)

* lua: add withPackages function

First step towards more automation similar to the haskell backend.
Follow up of https://github.com/NixOS/nixpkgs/pull/33903

pkgs/development/interpreters/lua-5/setup-hook.sh

@@ -0,0 +1,47 @@
+# set -e
+
+nix_print() {
+    if (( "${NIX_DEBUG:-0}" >= $1 )); then
+        echo "$2"
+    fi
+}
+
+nix_debug() {
+    nix_print 3 "$1"
+}
+
+addToLuaSearchPathWithCustomDelimiter() {
+    local varName="$1"
+    local absPattern="$2"
+    # delete longest match starting from the lua placeholder '?'
+    local topDir="${absPattern%%\?*}"
+
+    # export only if the folder exists else LUA_PATH grows too big
+    if  [ ! -d "$topDir" ]; then return; fi
+
+    export "${varName}=${!varName:+${!varName};}${absPattern}"
+}
+
+addToLuaPath() {
+    local dir="$1"
+
+    if [[ ! -d "$dir" ]]; then
+        nix_debug "$dir not a directory abort"
+        return 0
+    fi
+    cd "$dir"
+    for pattern in @luapathsearchpaths@;
+    do
+        addToLuaSearchPathWithCustomDelimiter LUA_PATH "$PWD/$pattern"
+    done
+
+    # LUA_CPATH
+    for pattern in @luacpathsearchpaths@;
+    do
+        addToLuaSearchPathWithCustomDelimiter LUA_CPATH "$PWD/$pattern"
+    done
+    cd -
+}
+
+addEnvHooks "$hostOffset" addToLuaPath
+