Set GOPROXY conditionally

[sean-breen]

Proposed changes

Adds a new GitHub Action configure-goproxy which can determine which value to use for GOPROXY environment variable. If secrets are available it will use the one from Artifactory. If not it will use direct. This should allow both dependabot and forked branches to use the direct proxy when secrets are not available.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.00%. Comparing base (b198c00) to head (1c78f8e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1356      +/-   ##
==========================================
+ Coverage   84.88%   85.00%   +0.11%     
==========================================
  Files         100      100              
  Lines       14528    14528              
==========================================
+ Hits        12332    12349      +17     
+ Misses       1735     1716      -19     
- Partials      461      463       +2     

see 6 files with indirect coverage changes

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