add rollups

[nicpottier]

• write rollup ids to daily archives

[codecov-io]

Codecov Report

Merging #14 into master will increase coverage by 12.04%.
The diff coverage is 69.33%.

@@             Coverage Diff             @@
##           master      #14       +/-   ##
===========================================
+ Coverage   59.41%   71.45%   +12.04%     
===========================================
  Files           2        3        +1     
  Lines         239      487      +248     
===========================================
+ Hits          142      348      +206     
- Misses         72       82       +10     
- Partials       25       57       +32

Impacted Files	Coverage Δ
config.go	100% <100%> (ø)	⬆️
archiver.go	69.3% <66.51%> (+13%)	⬆️
s3.go	77.27% <77.27%> (ø)

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