test: use npm_config_allow_git all to install from git source (npm 12)

[MikeMcC399]

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

Situation

npx tap test/test-citgm.js includes a test

"citgm: omg-i-pass from git url" which installs directly from the URI

git+https://github.com/MylesBorins/omg-i-pass

This fails under npm 12 with EALLOWGIT because npm@12.0.0 disallows installing git tarball dependencies.

See https://docs.npmjs.com/cli/v12/using-npm/config#allow-git

Change

Add the environment variable npm_config_allow_git: 'all' to the test "citgm: omg-i-pass from git url" in test/test-citgm.js.

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/test-citgm.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 95.11%. Comparing base (eef880d) to head (b74aff8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1133      +/-   ##
==========================================
- Coverage   96.20%   95.11%   -1.09%     
==========================================
  Files          29       29              
  Lines        2213     2213              
==========================================
- Hits         2129     2105      -24     
- Misses         84      108      +24     

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