rpm-ostree 0.2: drop BASE_IMAGES_DIGESTS

STONEBLD-2326

The result never provided any value. Drop it.

Signed-off-by: Adam Cmiel <[email protected]>

task/rpm-ostree/0.2/MIGRATION.md

@@ -0,0 +1,43 @@
+# Migration from 0.1 to 0.2
+
+Version 0.2:
+
+* Removes the `BASE_IMAGES_DIGESTS` result. Please remove all the references to this
+  result from your pipeline.
+  * Note that the result never provided any value. It did not contain base image
+    digests, it contained a local-only reference for the **output** image
+    (`localhost/rhtap-final-image@sha256:...`). The task returns a usable reference
+    for the output image as well (`IMAGE_URL` + `IMAGE_DIGEST`).
+
+## Konflux-specific
+
+In a typical Konflux pipeline, the two tasks that used to depend on the `BASE_IMAGES_DIGESTS`
+result are `build-source-image` and `deprecated-base-image-check`.
+
+1. Make sure your version of `deprecated-base-image-check` is at least `0.4`.
+2. Remove the parameters that reference the `BASE_IMAGES_DIGESTS` result:
+
+```diff
+@@ -255,10 +255,8 @@ spec:
+     - name: build-source-image
+       params:
+       - name: BINARY_IMAGE
+         value: $(params.output-image)
+-      - name: BASE_IMAGES
+-        value: $(tasks.build-container.results.BASE_IMAGES_DIGESTS)
+       runAfter:
+       - build-container
+       taskRef:
+         params:
+@@ -282,10 +280,8 @@ spec:
+       - name: workspace
+         workspace: workspace
+     - name: deprecated-base-image-check
+       params:
+-      - name: BASE_IMAGES_DIGESTS
+-        value: $(tasks.build-container.results.BASE_IMAGES_DIGESTS)
+       - name: IMAGE_URL
+         value: $(tasks.build-container.results.IMAGE_URL)
+       - name: IMAGE_DIGEST
+         value: $(tasks.build-container.results.IMAGE_DIGEST)
+```

task/rpm-ostree/0.2/rpm-ostree.yaml

@@ -62,8 +62,6 @@ spec:
     name: IMAGE_URL
   - description: Image reference of the built image
     name: IMAGE_REF
-  - description: Digests of the base images used for build
-    name: BASE_IMAGES_DIGESTS
   - name: SBOM_BLOB_URL
     description: Reference, including digest to the SBOM blob
   stepTemplate:
@@ -234,9 +232,6 @@ spec:
     computeResources: {}
     script: |
       #!/bin/bash
-      # Expose base image digests
-      buildah images --format '{{ .Name }}:{{ .Tag }}@{{ .Digest }}' | grep -v $IMAGE > $(results.BASE_IMAGES_DIGESTS.path)
-
       base_image_name=$(buildah inspect --format '{{ index .ImageAnnotations "org.opencontainers.image.base.name"}}' $IMAGE | cut -f1 -d'@')
       base_image_digest=$(buildah inspect --format '{{ index .ImageAnnotations "org.opencontainers.image.base.digest"}}' $IMAGE)
       container=$(buildah from --pull-never $IMAGE)