test: use npm_config_extra_param for npm custom install test (npm 12)

[MikeMcC399]

• relates to npm 12 - npm run tap (2 failures) #1130

Situation

npx tap test/npm/test-npm-install.js fails under npm 12. It uses an undefined placeholder CLI option --extra-param in an npm install command.

npm@12.0.0 throws an error for unknown CLI flags.

The npm package omg-i-pass-with-install-param looks for the environment variable npm_config_extra_param in order to execute its install script successfully.

Change

Replace the parameter --extra-param with the environment variable npm_config_extra_param instead of passing it using the CLI. See https://docs.npmjs.com/cli/v12/using-npm/config#environment-variables

Verification

Test in CI actions/workflows/nodejs.yml for compatibility with npm 10 & 11.

Test locally using Node.js 26.7.0 / npm 12.0.2:

npx tap test/npm/test-npm-install.js

Checklist

• npm test passes
• contribution guidelines followed
  here

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.11%. Comparing base (eef880d) to head (37155c7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1132      +/-   ##
==========================================
- Coverage   96.20%   96.11%   -0.10%     
==========================================
  Files          29       29              
  Lines        2213     2213              
==========================================
- Hits         2129     2127       -2     
- Misses         84       86       +2     

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