fix(init): define working directory in check task for init script (#2852)

~~This fixes CI for current PRs until
denoland/deno#28655 is added to Deno 2.3.0.~~

This fixes CI until denoland/deno#28923 is
fixed. Then, we can use `Deno.makeTempDir()` and not have to use
`tmp_*/`.

Author: iuioiua

.gitignore

@@ -1,8 +1,6 @@
 _fresh/
-tmp/
 vendor/
 node_modules/
 .docs/
 .DS_Store
-tmp-*
 tmp_*