Write our own helper image to stop sidecars

[imjasonh]

Problem

Today, Tekton uses the tianon/true image to stop sidecar execution when steps complete. It's a small image that exits successfully immediately. We use it by updating sidecar containers' image to the true image, which stops the sidecar execution immediately (successfully).

This image isn't owned or maintained by the Tekton team, and though we expect it to be fairly stable and bug-free, we can't easily fix any bugs or add functionality if we decide we need to. It might also present licensing problems in some circumstances.

Proposal

Provide our own small Go binary in an image based on distroless to perform this functionality. For example, cmd/stop simply os.Exit(0)s immediately.

This image would be built and released using ko alongside all the other Tekton images.

If this seems reasonable, it should be a fairly #goodfirstissue for a potential new contributor.

[imjasonh]

Well don't I feel silly: #1510 😬

[vdemeester]

/kind feature

[dlorenc]

I think you just fixed this with #3025