issues/223: create dev certs if do not exists or expired

[komuw]

What:

• Create dev certs only if they do not exists or are expired.

Why:

• Fixes: only create dev certs if they are already expired(or close to expiry) #223

[codecov-commenter]

Codecov Report

Base: 72.60% // Head: 71.07% // Decreases project coverage by -1.53% ⚠️

Coverage data is based on head (5a99efe) compared to base (ece5804).
Patch coverage: 54.41% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #224      +/-   ##
==========================================
- Coverage   72.60%   71.07%   -1.53%     
==========================================
  Files          33       34       +1     
  Lines        2241     2247       +6     
==========================================
- Hits         1627     1597      -30     
- Misses        532      572      +40     
+ Partials       82       78       -4     

Impacted Files	Coverage Δ
id/id.go	80.00% <0.00%> (+5.00%)	⬆️
middleware/client_ip.go	100.00% <ø> (ø)
server/cert.go	1.60% <0.00%> (-0.46%)	⬇️
server/server.go	46.66% <5.55%> (+1.10%)	⬆️
server/pprof.go	86.84% <66.66%> (-0.34%)	⬇️
log/log.go	83.33% <83.05%> (+1.93%)	⬆️
middleware/recoverer.go	90.62% <90.00%> (ø)
middleware/log.go	64.15% <94.11%> (-15.20%)	⬇️
client/client.go	88.73% <100.00%> (+0.32%)	⬆️
middleware/loadshed.go	74.50% <100.00%> (+5.88%)	⬆️
... and 5 more

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