fix agent building locally, in ci and on release

[Racer159]

Description

This PR hotfixes agent building in CI, on release and locally

Related Issue

Fixes #N/A

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (security config, docs update, etc)

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

[Racer159]

Marking as ready for review, but wanted feedback on how to best handle the windows case. As I see it there would be a few ways to do it:

1. Drop the if statement entirely and always build the local version of the agent
2. Run both the linux/mac and windows versions of the command not caring that garbage will be output to the terminal
3. Create a shim to convert if [ "agent:local" = "agent:local"]; then make build-agent-image; fi to if ( "agent:local" = "agent:local" ) { make build-agent-image }
4. Now that we have fancy cmd syntax in the scripts to actions PR, add an OS only filter to that

[wirewc]

LGTM!

[jeff-mccoy]

left a few notes

[jeff-mccoy]

🥳