Make auth token configurable (no longer hardcoded)

[thomshutt]

No description provided.

[codecov]

Codecov Report

Merging #59 (b290c0e) into main (ee8a242) will decrease coverage by 0.15761%.
The diff coverage is 41.66667%.

@@                 Coverage Diff                 @@
##                main         #59         +/-   ##
===================================================
- Coverage   35.58719%   35.42958%   -0.15761%     
===================================================
  Files             17          17                 
  Lines           1124        1129          +5     
===================================================
  Hits             400         400                 
- Misses           677         682          +5     
  Partials          47          47                 

Impacted Files	Coverage Δ
clients/mist_client.go	44.82759% <0.00000%> (-0.98739%)	⬇️
api/http.go	54.28571% <60.00000%> (ø)
middleware/auth.go	93.33333% <100.00000%> (ø)

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Impacted Files	Coverage Δ
clients/mist_client.go	44.82759% <0.00000%> (-0.98739%)	⬇️
api/http.go	54.28571% <60.00000%> (ø)
middleware/auth.go	93.33333% <100.00000%> (ø)