give docker a tty output when expecting color

this makes the behavior more consistent with the system language
and would help the executable run in a docker container to
produce a colored output.

pre_commit/languages/docker.py

@@ -108,7 +108,7 @@ def get_docker_user() -> tuple[str, ...]:  # pragma: win32 no cover
         return ()
 
 
-def docker_cmd() -> tuple[str, ...]:  # pragma: win32 no cover
+def docker_cmd(color: bool) -> tuple[str, ...]:  # pragma: win32 no cover
     return (
         'docker', 'run',
         '--rm',
@@ -118,7 +118,7 @@ def docker_cmd() -> tuple[str, ...]:  # pragma: win32 no cover
         # unshared label. Only the current container can use a private volume.
         '-v', f'{_get_docker_path(os.getcwd())}:/src:rw,Z',
         '--workdir', '/src',
-    )
+    ) + (('--tty',) if color else ())
 
 
 def run_hook(
@@ -139,7 +139,7 @@ def run_hook(
 
     entry_tag = ('--entrypoint', entry_exe, docker_tag(prefix))
     return lang_base.run_xargs(
-        (*docker_cmd(), *entry_tag, *cmd_rest),
+        (*docker_cmd(color), *entry_tag, *cmd_rest),
         file_args,
         require_serial=require_serial,
         color=color,

pre_commit/languages/docker_image.py

@@ -23,7 +23,7 @@ def run_hook(
         require_serial: bool,
         color: bool,
 ) -> tuple[int, bytes]:  # pragma: win32 no cover
-    cmd = docker_cmd() + lang_base.hook_cmd(entry, args)
+    cmd = docker_cmd(color) + lang_base.hook_cmd(entry, args)
     return lang_base.run_xargs(
         cmd,
         file_args,