Fix linting errors

[tsopokis]

Fix linting errors, to prepare for adding linting checks in the pipelines.

[codecov]

Codecov Report

❌ Patch coverage is 43.47826% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.57%. Comparing base (890ad6c) to head (00fd740).

Files with missing lines	Patch %	Lines
internal/device/ssh/sshdevice.go	55.55%	3 Missing and 1 partial ⚠️
internal/configuration/configuration.go	0.00%	2 Missing ⚠️
internal/configuration/sequence.go	0.00%	1 Missing and 1 partial ⚠️
internal/packager/oci.go	0.00%	2 Missing ⚠️
internal/packager/validation.go	66.66%	1 Missing ⚠️
internal/publish/listen.go	0.00%	1 Missing ⚠️
internal/publish/push.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
- Coverage   37.73%   37.57%   -0.16%     
==========================================
  Files          23       23              
  Lines        1569     1570       +1     
==========================================
- Hits          592      590       -2     
- Misses        917      918       +1     
- Partials       60       62       +2     

Flag	Coverage Δ
unittests	37.57% <43.47%> (-0.16%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.