test(init): fix address in use

[fry69]

Reverting back to the old init script also re-introduced the "address in use" problem.

This does not have any effect: env: { PORT: "0" }

Adding arguments to deno task start also have no effect.

The only solution I can come up with is to ignore the task and call deno serve with proper arguments directly for the build tests.

[marvinhagemeister]

LGTM