increase test coverage, bump nats ver, failfast

[mikenye]

• bump nats server ver
• use failfast in github actions
• increase test coverage

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (c5d055d) 78.13% compared to head (d8fa698) 82.50%.

Files	Patch %	Lines
bordercontrol/cmd/bordercontrol/main.go	37.50%	8 Missing and 2 partials ⚠️
bordercontrol/lib/containers/containers.go	68.42%	5 Missing and 1 partial ⚠️
bordercontrol/lib/stunnel/stunnel.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
+ Coverage   78.13%   82.50%   +4.37%     
==========================================
  Files          20       19       -1     
  Lines        2959     2950       -9     
==========================================
+ Hits         2312     2434     +122     
+ Misses        523      386     -137     
- Partials      124      130       +6     

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