Set the Sentry environment to COMPOSE_PROJECT_NAME

[icarito]

... and use RAILS_ENV as fallback.

Chose this option instead of replicating environment "production"
because the point of staging was to test everything in production.

The idea is to more easily tell apart events not from actual production.

Fixes #0000 (<=== Add issue number here)

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[icarito]

This addresses sysadmin issue https://github.com/steviepubliclab/web/issues/268

[codecov]

Codecov Report

Merging #7796 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7796   +/-   ##
=======================================
  Coverage   81.96%   81.96%           
=======================================
  Files          97       97           
  Lines        5629     5629           
=======================================
  Hits         4614     4614           
  Misses       1015     1015