label dumping tool build depend .env file

[wuhuizuo]

Bug Report

• I have searched the issues of this repository and believe that this is not a duplicate.

Steps to reproduce(Optional)

1. run cargo build in tools/label-dumpling dir

What is expected?

1. build succeed

What is actually happening?

Suggest

there should not have dependencies in building, specially other runtime file or variable.

[ti-chi-bot]

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/lifecycle stale

[ti-chi-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
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/lifecycle rotten