fix(ssh): add authentication middleware

[aymanbagabas]

We need to verify that the key used to establish the connection is the same key used for authentication, otherwise, refuse connection.

[codecov]

Codecov Report

Attention: 2054 lines in your changes are missing coverage. Please review.

Comparison is base (050a0d1) 50.52% compared to head (9b6a761) 50.36%.
Report is 52 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #388      +/-   ##
==========================================
- Coverage   50.52%   50.36%   -0.17%     
==========================================
  Files         107      133      +26     
  Lines        8209    11321    +3112     
==========================================
+ Hits         4148     5702    +1554     
- Misses       3767     5179    +1412     
- Partials      294      440     +146     

Files	Coverage Δ
git/repo.go	50.69% <ø> (+6.71%)	⬆️
server/backend/backend.go	100.00% <100.00%> (ø)
server/backend/collab.go	86.66% <100.00%> (+0.95%)	⬆️
server/config/config.go	80.66% <100.00%> (+0.66%)	⬆️
server/config/file.go	100.00% <ø> (ø)
server/config/ssh.go	100.00% <100.00%> (ø)
server/cron/cron.go	90.00% <100.00%> (+30.00%)	⬆️
server/db/context.go	85.71% <100.00%> (ø)
server/db/db.go	43.90% <ø> (ø)
server/db/errors.go	31.57% <ø> (ø)
... and 69 more

... and 4 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.