fix(ci): add explicit path to main in ko

[lachlanharrisdev]

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• I have read CONTRIBUTING.md and the AI Usage Policy
• The project builds and runs successfully (i.e. go run .)
• Tests pass locally on my machine (i.e. go test ./...)
  • Relevant tests have been updated / created
  • Code passes linting checks (i.e. golangci-lint run; install)
• Relevant documentation has been updated / created (here)