fix: calculate correctly image digests for the catalog

Use buldkit's metadata file to find what went into the build instead of
trying to resolve the digests on the fly.

Depends on kres change: siderolabs/kres#627

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>
(cherry picked from commit 4328287)

Author: smira

.kres.yaml

@@ -118,8 +118,6 @@ spec:
       toplevel: true
     - name: check-dirty
       toplevel: true
-    - name: extensions-metadata
-      toplevel: true
     - name: internal/extensions/image-digests
       toplevel: true
     - name: internal/extensions/descriptions.yaml
@@ -178,31 +176,18 @@ spec:
     condition: on-pull-request
 ---
 kind: custom.Step
-name: extensions-metadata
-spec:
-  makefile:
-    enabled: true
-    phony: true
-    depends:
-      - $(ARTIFACTS)/bldr
-    script:
-      - |
-        @rm -f _out/extensions-metadata
-        @$(foreach target,$(TARGETS),echo $(REGISTRY)/$(USERNAME)/$(target):$(shell $(ARTIFACTS)/bldr eval --target $(target) --build-arg TAG=$(TAG) '{{.VERSION}}' 2>/dev/null) >> _out/extensions-metadata;)
-        @$(foreach target,$(NONFREE_TARGETS),echo $(REGISTRY)/$(USERNAME)/$(target):$(shell $(ARTIFACTS)/bldr eval --target $(target) --build-arg TAG=$(TAG) '{{.VERSION}}' 2>/dev/null) >> _out/extensions-metadata;)
----
-kind: custom.Step
 name: internal/extensions/image-digests
 spec:
   makefile:
     enabled: true
     phony: true
     depends:
-      - extensions-metadata
+      - $(ARTIFACTS)/bldr
     script:
       - |
-        @echo "Generating image digests..."
-        @cat _out/extensions-metadata | xargs -I{} sh -c 'echo {}@$$(crane digest {})' > internal/extensions/image-digests
+        @rm -f internal/extensions/image-digests
+        @$(foreach target,$(TARGETS),echo $(shell yq -r '."image.name" + "@" + ."containerimage.digest"' $(ARTIFACTS)/$(target).metadata.json) >> internal/extensions/image-digests;)
+        @$(foreach target,$(NONFREE_TARGETS),echo $(shell yq -r '."image.name" + "@" + ."containerimage.digest"' $(ARTIFACTS)/$(target).metadata.json) >> internal/extensions/image-digests;)
 ---
 kind: custom.Step
 name: internal/extensions/descriptions.yaml

Makefile

@@ -1,6 +1,6 @@
 # THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
 #
-# Generated on 2026-03-18T16:47:13Z by kres 3675077.
+# Generated on 2026-03-17T13:52:47Z by kres 7bfd168-dirty.
 
 # common variables
 
@@ -255,16 +255,11 @@ extensions-catalog: $(ARTIFACTS)/bldr
 check-dirty:
 	@if test -n "`git status --porcelain`"; then echo "Source tree is dirty"; git status; git diff; exit 1 ; fi
 
-.PHONY: extensions-metadata
-extensions-metadata: $(ARTIFACTS)/bldr
-	@rm -f _out/extensions-metadata
-	@$(foreach target,$(TARGETS),echo $(REGISTRY)/$(USERNAME)/$(target):$(shell $(ARTIFACTS)/bldr eval --target $(target) --build-arg TAG=$(TAG) '{{.VERSION}}' 2>/dev/null) >> _out/extensions-metadata;)
-	@$(foreach target,$(NONFREE_TARGETS),echo $(REGISTRY)/$(USERNAME)/$(target):$(shell $(ARTIFACTS)/bldr eval --target $(target) --build-arg TAG=$(TAG) '{{.VERSION}}' 2>/dev/null) >> _out/extensions-metadata;)
-
 .PHONY: internal/extensions/image-digests
-internal/extensions/image-digests: extensions-metadata
-	@echo "Generating image digests..."
-	@cat _out/extensions-metadata | xargs -I{} sh -c 'echo {}@$$(crane digest {})' > internal/extensions/image-digests
+internal/extensions/image-digests: $(ARTIFACTS)/bldr
+	@rm -f internal/extensions/image-digests
+	@$(foreach target,$(TARGETS),echo $(shell yq -r '."image.name" + "@" + ."containerimage.digest"' $(ARTIFACTS)/$(target).metadata.json) >> internal/extensions/image-digests;)
+	@$(foreach target,$(NONFREE_TARGETS),echo $(shell yq -r '."image.name" + "@" + ."containerimage.digest"' $(ARTIFACTS)/$(target).metadata.json) >> internal/extensions/image-digests;)
 
 .PHONY: internal/extensions/descriptions.yaml
 internal/extensions/descriptions.yaml: internal/extensions/image-digests
@@ -305,4 +300,3 @@ release-notes: $(ARTIFACTS)
 conformance:
 	@docker pull $(CONFORMANCE_IMAGE)
 	@docker run --rm -it -v $(PWD):/src -w /src $(CONFORMANCE_IMAGE) enforce
-