Ensure npmrc is encrypted before pushing to github

[hardillb]

fixes #5658

Description

Ensures that the .npmrc file is encrypted when pushed to GitHub and decrypted (if required) when pulled.

This needs to happen because if GH spots a npm token being checked in it rejects the push to prevent leaking tokens in public repos.

I can't find any existing tests for the gitops stuff and since it's limited to only working with github hosted repos I can't see how to test this without having to add a user token to the tests. If I could bypass the github requirement I could create a local directory git repo to test with.

Tagging @Steve-Mcl rather than Nick as he has enough to do today before he heads out.

Related Issue(s)

#5658

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.48%. Comparing base (e4dba78) to head (95e18ac).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
forge/ee/lib/gitops/index.js	12.50%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5898      +/-   ##
==========================================
- Coverage   76.51%   76.48%   -0.03%     
==========================================
  Files         369      369              
  Lines       17994    18001       +7     
  Branches     4194     4197       +3     
==========================================
  Hits        13768    13768              
- Misses       4226     4233       +7     

Flag	Coverage Δ
backend	76.48% <12.50%> (-0.03%)	⬇️

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