Update README.md (#197)

- Change the title because "konflux-ci/buildah" is not a thing anymore
  (never existed on Github, does exist on quay.io but will no longer
  receive updates).
- Reword the introduction because this repo doesn't even build buildah
  anymore.
- Drop the explanation of the CEL annotation setup, because it isn't
  accurate anymore.
- Drop the mention of the buildah submodule, replace with
  dockerfile-json (the only remaining submodule).

Signed-off-by: Adam Cmiel <acmiel@redhat.com>

Author: chmeliik

README.md

@@ -1,30 +1,20 @@
-# konflux-ci/buildah
+# konflux-ci/buildah-task
 
-This is a rebuild of [containers/buildah](https://github.com/containers/buildah) for use in Konflux-CI. Two images are produced by this repository. One is a simple rebuild of `buildah` and is available at [quay.io/konflux-ci/buildah:latest](https://quay.io/konflux-ci/buildah). The other is oriented at customizing the behavior of `buildah` within Tekton tasks and is available at [quay.io/konflux-ci/buildah-task:latest](https://quay.io/konflux-ci/buildah-task).
+This is an image that contains the tools and Bash scripts needed for the Konflux buildah task.
+It is available at [quay.io/konflux-ci/buildah-task:latest](https://quay.io/konflux-ci/buildah-task).
 
 ## Building artifacts
 
-By default, new artifacts will not be built when only the contents of the `.tekton` have changed for push events. These changes will
-still be tested for pull request events. If you want to trigger a rebuild of an artifact for push events, you can manually trigger one
-as mentioned in the [Konflux documentation](https://konflux-ci.dev/docs/building/rerunning/).
-
-To see when new builds will be triggered for push events, you can look at the `pipelinesascode.tekton.dev/on-cel-expression` annotation
-for the specific components. For example, the `buildah-task` component will only be built if there are changes to its Containerfile or
-either of the dependencies mentioned.
-
-```yaml
-    pipelinesascode.tekton.dev/on-cel-expression: event == "push" && target_branch == "main" &&
-      ("dockerfile-json".pathChanged() ||
-      "Containerfile.task".pathChanged() ||
-      "scripts/**".pathChanged())
-```
+Konflux triggers builds automatically for push events (if the relevant files change).
+To see what files are considered relevant, check the `pipelinesascode.tekton.dev/on-cel-expression`
+annotation in the PipelineRun files in `.tekton/`.
 
 ## Updating the git submodule
 
 ```bash
-git init buildah
-cd buildah
-git checkout main && git pull
+git init dockerfile-json
+cd dockerfile-json
+git checkout dev && git pull
 cd ..
 ```
 
@@ -48,4 +38,4 @@ While you can find the Snapshot via the Konflux UI, you can also identify the la
 ```bash
 $ kconfig=<path-to-kubeconfig> && for application in $(oc get applications --no-headers=true -o custom-columns=":metadata.name" --kubeconfig=$kconfig); do oc get snapshots -l "pac.test.appstudio.openshift.io/event-type in (push, Push),appstudio.openshift.io/application=${application}" --sort-by=.metadata.creationTimestamp --kubeconfig=$kconfig | tail -1; done | grep buildah-container
 buildah-container-xcrf4   20d
-```
+```