chore(ci): move image builds to depot

[goocarlos]

Moves the daemon image workflow from local Docker builds on the runner to Depot remote container builds.

What changed:

• added depot.json and set the workflow to use DEPOT_PROJECT_ID
• switched the build job to depot/setup-action@v1 + depot/build-push-action@v1
• added permissions.id-token: write for OIDC auth
• removed runner-local docker build / docker tag / docker push loops
• switched to digest artifacts plus a manifest-creation step for the final multi-arch tags

Cache strategy:

• removed GitHub Actions layer cache export/import
• rely on Depot's native layer cache instead of type=gha

Local developer scripts were not changed.

[gemini-code-assist]

Code Review

This pull request adds a new depot.json configuration file. The review feedback suggests renaming the id field to project to ensure the project is correctly identified by the Depot CLI and GitHub Actions.

[gemini-code-assist]

The Depot configuration file should use the key project instead of id. The Depot CLI and associated GitHub Actions look for the project field to identify the target project. Using id may cause the project to be undetected if not otherwise specified in the workflow environment.

Suggested change

	{"id":"smkxz53ddb"}
	{"project":"smkxz53ddb"}

[fatelei]

rebase main code