fix: spawning of gpg to read config

[aduh95]

Regarding GPG_BIN:

node-core-utils/docs/git-node.md

Lines 418 to 419 in 9b642b0

	1. A GPG client. By default it will look at the `GPG_BIN` environment variable,
	and fallback to `gpg` if not provided.

Caching getMergedConfig as it typically gets called 4 times when starting git-node:

Error: Encrypted config detected, spawning gpg to decrypt it...
    at getConfig (…/lib/config.js:32:18)
    at getMergedConfig (…/lib/config.js:22:24)
    at …/components/git/metadata.js:11:16
    at ModuleJob.run (node:internal/modules/esm/module_job:345:25)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:651:26)
    at async Promise.all (index 2)
Error: Encrypted config detected, spawning gpg to decrypt it...
    at getConfig (…/lib/config.js:32:18)
    at getMergedConfig (…/lib/config.js:22:24)
    at auth (…/lib/auth.js:73:30)
    at …/lib/auth.js:39:19
    at main (…/components/git/land.js:167:29)
    at land (…/components/git/land.js:158:21)
    at Object.handler (…/components/git/land.js:143:12)
    at …/node_modules/yargs/build/lib/command.js:206:54
    at maybeAsyncResult (…/node_modules/yargs/build/lib/utils/maybe-async-result.js:9:15)
    at CommandInstance.handleValidationAndGetResult (…/node_modules/yargs/build/lib/command.js:205:25)
Error: Encrypted config detected, spawning gpg to decrypt it...
    at getConfig (…/lib/config.js:32:18)
    at getMergedConfig (…/lib/config.js:22:24)
    at proxy (…/lib/proxy.js:9:18)
    at new Request (…/lib/request.js:22:23)
    at main (…/components/git/land.js:170:15)
Error: Encrypted config detected, spawning gpg to decrypt it...
    at getConfig (…/lib/config.js:32:18)
    at getMergedConfig (…/lib/config.js:22:24)
    at new Session (…/lib/session.js:22:24)
    at new LandingSession (…/lib/landing_session.js:25:5)
    at main (…/components/git/land.js:171:17)

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.77%. Comparing base (9b642b0) to head (926f90d).

Files with missing lines	Patch %	Lines
lib/config.js	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #991      +/-   ##
==========================================
+ Coverage   79.73%   79.77%   +0.03%     
==========================================
  Files          39       39              
  Lines        4664     4672       +8     
==========================================
+ Hits         3719     3727       +8     
  Misses        945      945              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.