[#821] Support Snapcraft distribution

[yohamta]

Resolves #821

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.89%. Comparing base (83bcb60) to head (764b8ce).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #824      +/-   ##
==========================================
- Coverage   55.93%   55.89%   -0.04%     
==========================================
  Files          73       73              
  Lines        7920     7920              
==========================================
- Hits         4430     4427       -3     
- Misses       3110     3112       +2     
- Partials      380      381       +1     

Files with missing lines	Coverage Δ
internal/digraph/executor/mail.go	32.75% <ø> (ø)

... and 1 file with indirect coverage changes

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