Add definitions used to release the E2E base image

packages/e2e/base-image/.dockerignore

@@ -0,0 +1 @@
+tekton

packages/e2e/base-image/tekton/README.md

@@ -0,0 +1,23 @@
+# Tekton Dashboard E2E base image
+
+## Create a release
+
+To create a release:
+- verify the `CHROME_VERSION` and `NODE_VERSION` args in the [`Dockerfile`](../Dockerfile) on the main branch are correct
+- set a matching tag value in the `TAGS` environment variable in the [`CronJob`](./cronjob.yaml), e.g. `node20.11.0-chrome121`
+- apply the `CronJob` to the default namespace on the dogfooding cluster (`kubectl apply -k .`)
+- create a `Job` from the `CronJob` to trigger the release
+ ```bash
+ kubectl create job --from=cronjob/image-build-cron-trigger-dashboard-e2e-base dashboard-e2e-base-$(date +"%Y%m%d-%H%M")
+ ```
+- check the status of the [resulting `PipelineRun`](https://dashboard.dogfooding.tekton.dev/#/namespaces/default/pipelineruns?labelSelector=plumbing.tekton.dev%2Fimage%3Ddashboard-e2e-base)
+- confirm the image was [released and properly tagged](https://console.cloud.google.com/gcr/images/tekton-releases/global/dogfooding/dashboard-e2e-base)
+- open a PR to update the [E2E test `Dockerfile`](../../Dockerfile) to reference the new image
+
+## Future: automated releases
+
+We're currently leveraging the existing setup for nightly image releases documented at https://github.com/tektoncd/plumbing/tree/main/tekton/cronjobs
+
+However, the `CronJob` is deliberately suspended (i.e. disabled) so that it does not run on a schedule. This is due to the fact that the image is expected to change infrequently, only to pick up new browser / Node.js releases as needed.
+
+For now it must be triggered manually following the instructions above, but in future it will be automatically built and published on any change to its `Dockerfile`.

packages/e2e/base-image/tekton/cronjob.yaml

@@ -0,0 +1,46 @@
+# Copyright 2024 The Tekton Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+---
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+ name: image-build-cron-trigger
+spec:
+ schedule: "12 4 1 * *"
+ startingDeadlineSeconds: 60
+ suspend: true
+ concurrencyPolicy: Forbid
+ jobTemplate:
+ spec:
+ template:
+ spec:
+ initContainers:
+ - name: git
+ env:
+ - name: GIT_REPOSITORY
+ value: github.com/tektoncd/dashboard
+ - name: GIT_REVISION
+ value: main
+ containers:
+ - name: trigger
+ env:
+ - name: SINK_URL
+ value: el-image-builder.default.svc.cluster.local:8080
+ - name: TARGET_IMAGE
+ value: gcr.io/tekton-releases/dogfooding/dashboard-e2e-base
+ - name: CONTEXT_PATH
+ value: packages/e2e/base-image
+ - name: TAGS
+ value: latest,node20.11.0-chrome121

packages/e2e/base-image/tekton/kustomization.yaml

@@ -0,0 +1,22 @@
+# Copyright 2024 The Tekton Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+bases:
+- github.com/tektoncd/plumbing/tekton/cronjobs/bases/image-build?ref=main
+patchesStrategicMerge:
+- cronjob.yaml
+nameSuffix: "-dashboard-e2e-base"