Explain how to build new prow-tests images (knative#160)

* Explain how to build new prow-tests images * Explain the base image
coryrc · Oct 2, 2018 · 2b19286 · 2b19286
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diff --git a/images/prow-tests/README.md b/images/prow-tests/README.md
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 # Prow Test Job Image
 
 This directory contains the custom Docker image used by our Prow test jobs.
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+## Building and publishing a new image
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+To build and push a new image, just run `make push`.
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+For testing purposes you can build an image but not push it; to do so, run `make build`.
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+Note that you must have proper permission in the `knative-tests` project to push new images to the GCR.
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+The `prow-tests` image is pinned on a specific `kubekins` image; update `Dockerfile` if you need to use a newer/different image. This will basically define the versions of `bazel`, `go`, `kubectl` and other build tools.