introduce profileDirectory option in wdio-firefox-profile-service

[Unichron]

Proposed changes

Added profileDirectory option to wdio-firefox-profile-service. This makes it possible to specify a directory with a pre-made profile. This allows one to configure client certificates. It may also make other things possible which I don't know about.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

Reviewers: @webdriverio/technical-committee

[codecov]

Codecov Report

Merging #4250 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4250      +/-   ##
==========================================
+ Coverage   99.35%   99.35%   +<.01%     
==========================================
  Files         175      175              
  Lines        4323     4325       +2     
  Branches      926      927       +1     
==========================================
+ Hits         4295     4297       +2     
  Misses         25       25              
  Partials        3        3

Impacted Files	Coverage Δ
...kages/wdio-firefox-profile-service/src/launcher.js	100% <100%> (ø)	⬆️

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[christian-bromann]

👍