Grafana Agent build images

The Grafana Agent build images are used for CI workflows to manage builds of Grafana Agent.

There are two images:

• grafana/agent-build-image:X.Y.Z (for building Linux containers)

• grafana/agent-build-image:X.Y.Z-windows (for building Windows containers)

(Where X.Y.Z is replaced with some semantic version, like 0.14.0).

Pushing new images

Once a commit is merged to main which updates the build-image Dockerfiles, a maintainer must push a tag matching the pattern build-image/vX.Y.Z to the grafana/agent repo. For example, to create version v0.15.0 of the build images, a maintainer would push the tag build-image/v0.15.0.

NOTE: The tag name is expected to be prefixed with v, but the pushed images have the v prefix removed.

Automation will trigger off of this tag being pushed, building and pushing the new build images to Docker Hub.

A follow-up commit to use the newly pushed build images must be made.