build: skip publish npm if user not part of pyroscope org

[eh-am]

Previously when PRs were created by a non member of the pyroscope org, this checkout step would fail, due to the lack of access to the secrets:

This PR basically skips the entire pipeline if that secret is not present.

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
webapp/public/assets/app.js	444.27 KB (0%)	8.9 s (0%)	3.3 s (-1.56% 🔽)	12.1 s
webapp/public/assets/app.css	17.54 KB (0%)	351 ms (0%)	0 ms (+100% 🔺)	351 ms
webapp/public/assets/styles.css	9.5 KB (0%)	191 ms (0%)	0 ms (+100% 🔺)	191 ms
packages/pyroscope-flamegraph/dist/index.js	92.19 KB (0%)	1.9 s (0%)	1.5 s (+36.4% 🔺)	3.4 s
packages/pyroscope-flamegraph/dist/index.node.js	92.08 KB (0%)	1.9 s (0%)	531 ms (-14.66% 🔽)	2.4 s
packages/pyroscope-flamegraph/dist/index.css	7.38 KB (0%)	148 ms (0%)	0 ms (+100% 🔺)	148 ms

[codecov]

Codecov Report

Base: 66.53% // Head: 66.53% // No change to project coverage 👍

Coverage data is based on head (d851f19) compared to base (2c3cabe).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1594   +/-   ##
=======================================
  Coverage   66.53%   66.53%           
=======================================
  Files         148      148           
  Lines        5031     5031           
  Branches     1165     1165           
=======================================
  Hits         3347     3347           
  Misses       1679     1679           
  Partials        5        5           

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[Rperry2174]

LGTM