e2e tests

[akellbl4]

• adds playwright as testing framework
• adds a test with comment posting as dev user

[codecov]

Codecov Report

Merging #1464 (8d980b3) into master (499302c) will increase coverage by 0.01%.
The diff coverage is 50.00%.

❗ Current head 8d980b3 differs from pull request most recent head 25b03a5. Consider uploading reports for the commit 25b03a5 to get more accurate results

@@            Coverage Diff             @@
##           master    #1464      +/-   ##
==========================================
+ Coverage   58.12%   58.14%   +0.01%     
==========================================
  Files         131      131              
  Lines        2909     2910       +1     
  Branches      743      743              
==========================================
+ Hits         1691     1692       +1     
  Misses       1214     1214              
  Partials        4        4              

Impacted Files	Coverage Δ
frontend/apps/remark42/app/utils/post-message.ts	50.00% <50.00%> (ø)
...end/apps/remark42/app/components/comment/styles.ts	100.00% <0.00%> (ø)
...d/apps/remark42/app/components/comment/comment.tsx	62.38% <0.00%> (ø)

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[github-actions]

size-limit report 📦

Path	Size
public/embed.mjs	2.03 KB (0%)
public/remark.mjs	72.39 KB (-0.02% 🔽)
public/remark.css	8.2 KB (0%)
public/last-comments.mjs	35.53 KB (-0.02% 🔽)
public/last-comments.css	3.79 KB (0%)
public/deleteme.mjs	12.05 KB (0%)
public/counter.mjs	749 B (0%)

[akellbl4]

@umputun @paskal how can I pass $BUILDPLATFORM to here
https://github.com/umputun/remark42/runs/7965644294?check_suite_focus=true#step:4:9

[paskal]

Please tidy up the commit history. Twenty-eight commits, including merge ones, is too much.

Also, I expect something about e2e testing to be mentioned in the frontend Readme file.