feat: add docker labels of the OCI Image Format Specification

[itchyny]

Description

This PR adds pre-defined labels of the OCI Image Specification to the Docker images.
Also updates the homepage URLs of the Homebrew formulae.

Closes issue(s)

Resolve #2249.

Checklist

• I have tested this code
• I have added unit test to cover this code
• I have updated the documentation (README.md and /website/docs)
• I have followed the contributing guide

[netlify]

✅ Deploy Preview for go-feature-flag-doc-preview canceled.

Name	Link
🔨 Latest commit	9b14f48
🔍 Latest deploy log	https://app.netlify.com/sites/go-feature-flag-doc-preview/deploys/66c96c8a86c5570008065933

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.00%. Comparing base (5b3bd3b) to head (9b14f48).
Report is 47 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2258   +/-   ##
=======================================
  Coverage   86.00%   86.00%           
=======================================
  Files         102      102           
  Lines        3731     3731           
=======================================
  Hits         3209     3209           
  Misses        399      399           
  Partials      123      123           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[thomaspoignant]

Thanks for the pull request, i will review it when I am back and it will be available in the next version of GO Feature Flag.

[thomaspoignant]

Thanks for this contribution, I like the fact we provide more information 👌.
This will be available in the next release 🚀 .