update kanvas.yml to generate snapshot

[Aijeyomah]

Notes for Reviewers

This PR fixes #

• Fixed kanvas.yaml to accept the correct inputs.
• Changed workflowAccessToken to use secrets.GITHUB_TOKEN.
• Updated ldflags for local builds.
• Tweaked the payload needed for generating snapshots.

Signed commits

• Yes, I signed my commits.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (e85764d) to head (15c68d1).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/kanvas-snapshot/cmd.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master     #88   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files           4       4           
  Lines         219     221    +2     
======================================
- Misses        219     221    +2     

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

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