config: prefixes image names with ko:// scheme

This allows `ko` to improve the experience with Go modules. See
ko-build/ko#58 for more information.

Author: poy

config/controller.yaml

@@ -42,7 +42,7 @@ spec:
       serviceAccountName: tekton-pipelines-controller
       containers:
       - name: tekton-pipelines-controller
-        image: github.com/tektoncd/pipeline/cmd/controller
+        image: ko://github.com/tektoncd/pipeline/cmd/controller
         args: [
           "-kubeconfig-writer-image", "github.com/tektoncd/pipeline/cmd/kubeconfigwriter",
           "-creds-image", "github.com/tektoncd/pipeline/cmd/creds-init",

config/webhook.yaml

@@ -48,7 +48,7 @@ spec:
       - name: webhook
         # This is the Go import path for the binary that is containerized
         # and substituted here.
-        image: github.com/tektoncd/pipeline/cmd/webhook
+        image: ko://github.com/tektoncd/pipeline/cmd/webhook
         env:
         - name: SYSTEM_NAMESPACE
           valueFrom: