Add linting as CI step

[thomshutt]

Let's try and lint from the start of this project

[codecov]

Codecov Report

Merging #38 (e7139c3) into main (14b71d8) will decrease coverage by 1.76833%.
The diff coverage is 3.22581%.

@@                 Coverage Diff                 @@
##                main         #38         +/-   ##
===================================================
- Coverage   44.42675%   42.65842%   -1.76833%     
===================================================
  Files             12          12                 
  Lines            628         647         +19     
===================================================
- Hits             279         276          -3     
- Misses           312         332         +20     
- Partials          37          39          +2     

Impacted Files	Coverage Δ
api/http.go	57.14286% <0.00000%> (ø)
handlers/ok.go	40.00000% <0.00000%> (-60.00000%)	⬇️
handlers/triggers.go	0.00000% <0.00000%> (ø)
handlers/upload.go	44.92754% <0.00000%> (-2.83365%)	⬇️
middleware/logging.go	0.00000% <0.00000%> (ø)
handlers/transcode.go	44.44444% <100.00000%> (ø)

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Impacted Files	Coverage Δ
api/http.go	57.14286% <0.00000%> (ø)
handlers/ok.go	40.00000% <0.00000%> (-60.00000%)	⬇️
handlers/triggers.go	0.00000% <0.00000%> (ø)
handlers/upload.go	44.92754% <0.00000%> (-2.83365%)	⬇️
middleware/logging.go	0.00000% <0.00000%> (ø)
handlers/transcode.go	44.44444% <100.00000%> (ø)