Move remaining use of Tekton-produced images from gcr.io to ghcr.io

Most images produced by Tekton projects, including tooling built from
tektoncd/plumbing, are now consumed from ghcr.io.

The one remaining image still coming from gcr.io/tekton-releases is
the E2E base image. This will also be migrated once the single
arch image build pipeline is updated to publish to ghcr.io instead.

docs/install.md

@@ -22,7 +22,7 @@ This guide explains how to install Tekton Dashboard. It covers the following top
 Choose the version of Tekton Dashboard you want to install. You have the following options:
 
 - **[Official](https://github.com/tektoncd/dashboard/releases)** - install this unless you have a specific reason to go for a different release.
-- **[Nightly](https://gcr.io/tekton-nightly)** - may contain bugs, install at your own risk.
+- **[Nightly](https://ghcr.io/tektoncd/dashboard)** - may contain bugs, install at your own risk.
 - **[`HEAD`]** - this is the bleeding edge. It contains unreleased code that may result in unpredictable behavior. To get started, see the [development guide](../DEVELOPMENT.md) instead of this page.
 
 ## Pre-requisites

releases.md

@@ -15,8 +15,14 @@ as follows:
     - Releases happen towards the middle of the month, between the 13th and the
       20th, depending on week-ends and readiness
 
-Tekton Dashboard produces nightly builds, publicly available on
-`gcr.io/tekton-nightly`. 
+Tekton Dashboard produces nightly builds, publicly available at:
+- [read-only](https://storage.googleapis.com/tekton-releases-nightly/dashboard/latest/release.yaml)
+- [read/write](https://storage.googleapis.com/tekton-releases-nightly/dashboard/latest/release-full.yaml)
+
+The images for Dashboard releases are published to `ghcr.io/tektoncd/dashboard`.
+
+Prior to 26th September 2024, nightly images were published to `gcr.io/tekton-nightly`.
+For release v0.50.x and earlier, release images were published to `gcr.io/tekton-releases`.
 
 ## Release Process
 

tekton/publish.yaml

@@ -100,7 +100,7 @@ spec:
         cp ${DOCKER_CONFIG} /workspace/docker-config.json
 
     - name: run-ko
-      image: gcr.io/tekton-releases/dogfooding/ko-gcloud:v20240920-6c2a999d36@sha256:1756ca55a09b360028695792e638a7cc366292d7aef44c926a8cb765085664c8
+      image: ghcr.io/tektoncd/plumbing/ko-gcloud:v20240920-6c2a999d36@sha256:1756ca55a09b360028695792e638a7cc366292d7aef44c926a8cb765085664c8
       env:
         - name: KO_DOCKER_REPO
           value: $(params.imageRegistry)/$(params.imageRegistryPath)
@@ -144,7 +144,7 @@ spec:
         ./scripts/installer build --debug              --platform $(params.platforms) --tag $(params.versionTag) --output $OUTPUT_RELEASE_DIR/release.yaml ${KO_EXTRA_ARGS}
         ./scripts/installer build --debug --read-write --platform $(params.platforms) --tag $(params.versionTag) --output $OUTPUT_RELEASE_DIR/release-full.yaml ${KO_EXTRA_ARGS}
     - name: koparse
-      image: gcr.io/tekton-releases/dogfooding/koparse:v20240923-1c3aa3eee7@sha256:ae363d70e3c2fb75e96aaeb561dcea20383c27a47f0266c8179bbb72b89c2430
+      image: ghcr.io/tektoncd/plumbing/koparse:v20240923-1c3aa3eee7@sha256:ae363d70e3c2fb75e96aaeb561dcea20383c27a47f0266c8179bbb72b89c2430
       script: |
         set -ex