Upload code coverage

[randombenj]

Description of the Change

Renable code coverage reports https://app.codecov.io/gh/aptly-dev/aptly/

[codecov]

Codecov Report

Merging #1085 (ae30cbc) into master (3266aa3) will decrease coverage by 11.64%.
The diff coverage is 29.96%.

@@             Coverage Diff             @@
##           master    #1085       +/-   ##
===========================================
- Coverage   63.79%   52.15%   -11.65%     
===========================================
  Files          54       73       +19     
  Lines        6674    11257     +4583     
===========================================
+ Hits         4258     5871     +1613     
- Misses       1890     4822     +2932     
- Partials      526      564       +38     

Impacted Files	Coverage Δ
api/db.go	0.00% <0.00%> (ø)
api/gpg.go	0.00% <0.00%> (ø)
api/graph.go	0.00% <0.00%> (ø)
api/middleware.go	0.00% <0.00%> (ø)
api/packages.go	0.00% <0.00%> (ø)
api/publish.go	0.00% <0.00%> (ø)
api/repos.go	0.00% <0.00%> (ø)
api/snapshot.go	0.00% <0.00%> (ø)
context/context.go	10.70% <0.00%> (-0.44%)	⬇️
deb/changes.go	59.72% <ø> (-0.02%)	⬇️
... and 87 more

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