Add github token in buf gh action

[eapolinario]

Why are the changes needed?

The buf gh action hits a ratelimit, e.g. [1]. In this PR we pass the github_token to increase the limits.

What changes were proposed in this pull request?

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6a7e620) 59.03% compared to head (5b339e7) 59.03%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4626   +/-   ##
=======================================
  Coverage   59.03%   59.03%           
=======================================
  Files         622      622           
  Lines       52793    52793           
=======================================
  Hits        31164    31164           
  Misses      19142    19142           
  Partials     2487     2487           

Flag	Coverage Δ
unittests	59.03% <ø> (ø)

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