Draft: Feature: Add Pull Snapshot API

[reglim]

Requirements

All new code should be covered with tests, documentation should be updated. CI should pass.

Description of the Change

Useful for remote management of repo servers.

Checklist

• unit-test added (if change is algorithm)
• functional test added/updated (if change is functional)
• man page updated (if applicable)
• bash completion updated (if applicable)
• documentation updated
• author name in AUTHORS

[codecov]

Codecov Report

Merging #1162 (86b616a) into master (77e02bf) will decrease coverage by 0.56%.
The diff coverage is 0.72%.

@@            Coverage Diff             @@
##           master    #1162      +/-   ##
==========================================
- Coverage   66.23%   65.68%   -0.56%     
==========================================
  Files         143      143              
  Lines       16134    16271     +137     
==========================================
+ Hits        10687    10688       +1     
- Misses       4696     4832     +136     
  Partials      751      751              

Impacted Files	Coverage Δ
api/snapshot.go	0.00% <0.00%> (ø)
api/router.go	76.66% <100.00%> (+0.15%)	⬆️

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