Add flag to enforce mTLS

[S-Bohn]

Adds dedicated mTLS enabled endpoint, see: #147

[codecov]

Codecov Report

Merging #148 (368aa04) into master (90bb2f8) will not change coverage.
The diff coverage is n/a.

❗ Current head 368aa04 differs from pull request most recent head 30b248c. Consider uploading reports for the commit 30b248c to get more accurate results

@@           Coverage Diff           @@
##           master     #148   +/-   ##
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  Coverage   37.14%   37.14%           
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  Files           1        1           
  Lines          70       70           
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  Hits           26       26           
  Misses         44       44           

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unittests	37.14% <ø> (ø)

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[S-Bohn]

Hey @moul – sorry for the long delay.

I updated that PR with a more straightforward solution. I just added a new flag that enforces client-cert authentication. This solves my issue writing the e2e test and probably has less impact.