Teach Sentry to recognize docker-compose project as environment

[icarito]

This is analogous to publiclab/plots2#7796

It's meant to avoid events from staging to alert admins.

Fixes https://github.com/steviepubliclab/web/issues/268

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[codeclimate]

Code Climate has analyzed commit ad09542 and detected 0 issues on this pull request.

View more on Code Climate.

[icarito]

Testing this in unstable

[codecov]

Codecov Report

Merging #1252 into main will increase coverage by 0.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1252      +/-   ##
==========================================
+ Coverage   72.92%   73.28%   +0.35%     
==========================================
  Files          40       40              
  Lines        1400     1400              
==========================================
+ Hits         1021     1026       +5     
+ Misses        379      374       -5     

Impacted Files	Coverage Δ
lib/exporter.rb	94.17% <0.00%> (+2.24%)	⬆️

[cesswairimu]

🎉