feat: rebuild objectstorage-sidecar image

cosi/objectstorage-sidecar/Dockerfile

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+# syntax=docker/dockerfile:1
+
+# From image should be `gcr.io/k8s-staging-sig-storage/objectstorage-controller`.
+ARG SOURCE_IMAGE
+
+FROM ${SOURCE_IMAGE}
+
+# Same ENTRYPOINT as in the SOURCE_IMAGE
+ENTRYPOINT ["/sidecar"]

cosi/objectstorage-sidecar/Makefile

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+SOURCE_IMAGE_REPO ?= gcr.io/k8s-staging-sig-storage/objectstorage-sidecar
+SOURCE_IMAGE_VERSION ?= v20250123-a0e4046
+SOURCE_IMAGE ?= $(SOURCE_IMAGE_REPO):$(SOURCE_IMAGE_VERSION)
+
+TARGET_IMAGE_REPO ?= ghcr.io/mesosphere/dkp-container-images/objectstorage-sidecar
+TARGET_IMAGE_VERSION ?= $(SOURCE_IMAGE_VERSION)
+TARGET_IMAGE ?= $(TARGET_IMAGE_REPO):$(TARGET_IMAGE_VERSION)
+
+.PHONY: docker-build
+docker-build:
+	docker build --build-arg="SOURCE_IMAGE=$(SOURCE_IMAGE)" -t $(TARGET_IMAGE) .
+
+.PHONY: build-args
+build-args:
+	@echo "SOURCE_IMAGE=$(SOURCE_IMAGE)"
+	@echo "TARGET_IMAGE=$(TARGET_IMAGE)"
+	@echo "TARGET_IMAGE_VERSION=$(TARGET_IMAGE_VERSION)"

cosi/objectstorage-sidecar/README.md

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+# objectstorage-controller
+
+A custom build of `gcr.io/k8s-staging-sig-storage/objectstorage-sidecar:` container image. The registry hosting this image is being shut down https://console.cloud.google.com/gcr/images/k8s-staging-sig-storage/global/objectstorage-sidecar. 
+
+The Dockerile will be based on the upstream project https://github.com/kubernetes-sigs/container-object-storage-interface/blob/main/sidecar/Dockerfile.
+
+## Build
+
+```shell
+make docker-build
+```