fix: get correct env from npm config

[abcfy2]

npm config set VAR VAL will inject npm_config_var=val environment variable. This commit will solve this issue

Closes: #24556

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[abcfy2]

Can we add a test for this?

I don't know how to add this test case. Because npm config set FOO BARshould execute before test.

If we add this command in unit test, then we should execute this test in sub process.

[abcfy2]

Can we add a test for this?

I try to add a simple unit test for this. You can review again. Thanks.

[abcfy2]

Hi @marktnoonan . Please review my PR and let me know if I lost something. Thanks.

[mjhenkes]

Yay a green build, @abcfy2 thanks for the PR and being patient while i got the build fixed!