Fix #2343, support pre-commit

[Freed-Wu]

It still has problem.

$ ~/.cache/pre-commit/repodgg0oidb/lua_env-default/lib/luarocks/rocks-5.1/lua-language-server/scm-1/bin/lua-language-server --check .
# ...
spec/test_spec.lua:8:16 [Warning] Undefined field `are`. (undefined-field)
            assert.are.equal(parse_key("<M-C-S>", {}), parse_key("s", { "Control", "Alt" }))
                   ^^^
Diagnosis complete, 49 problems found
$ echo $?
1

It is expected. However,

$ ~/.cache/pre-commit/repodgg0oidb/lua_env-default/bin/lua-language-server --check .
# ...
spec/test_spec.lua:8:16 [Warning] Undefined field `are`. (undefined-field)
            assert.are.equal(parse_key("<M-C-S>", {}), parse_key("s", { "Control", "Alt" }))
                   ^^^
Diagnosis complete, 49 problems found
$ echo $?
0

Because it return 0, check always be passed.

$ pre-commit run lua-language-server-check -a
[INFO] Initializing environment for https://github.com/Freed-Wu/lua-language-server.
[INFO] Installing environment for https://github.com/Freed-Wu/lua-language-server.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
lua language server check................................................Passed

Test file:

---
repos:
  - repo: https://github.com/Freed-Wu/lua-language-server
    rev: 3.15.1
    hooks:
      - id: lua-language-server-check