[CP 1631] Add CONTAINER_ENGINE to makefile

[ci-penbot-01]

cp of pensando/gpu-operator#1631

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Source PR Description (pensando/gpu-operator#1631):

Add CONTAINER_ENGINE ?= docker to the Makefile in support of alternative docker compatible container tools. The same functionality exists in the network-operator and simplifies development builds for anyone using a docker alternative like podman.

This does not affect any existing workflows or CI/CD and only supports local development builds that do not use docker

TESTING
I use make CONTAINER_ENGINE=podman docker-build bundle-build in my workflow for dev builds.

Cherrypick triggered by: ACP-Automation

[ci-penbot-01]

AI-Assisted Cherry-Pick

Source PR: #1631
Target Branch: main

The cherry-pick operation encountered merge conflicts which were resolved automatically using AI assistance.

Files with conflicts (resolved by AI):

• Makefile:44-48
• Makefile:156-160
• Makefile:384-398

Original conflict in Makefile

Added missing REMEDIATION_CONFIGMAP_UTIL variable definitions that were needed for the new targets being introduced

Original conflict in Makefile

<<<<<<< HEAD
	@docker run --rm $(DOCKER_IT_FLAGS) --privileged \
=======
	@$(CONTAINER_ENGINE) run --rm -it --privileged \
>>>>>>> 3c7ef22f... Add CONTAINER_ENGINE to makefile (#1631)

Resolution: Used $(CONTAINER_ENGINE) from incoming but kept $(DOCKER_IT_FLAGS) from HEAD for better CI support

Original conflict in Makefile

<<<<<<< HEAD
=======
.PHONY: docker-build-remediation-configmap-util
docker-build-remediation-configmap-util: ## Build the docker image for remediation configmap util.
	DOCKER_BUILDKIT=1 $(CONTAINER_ENGINE) build -t $(REMEDIATION_CONFIGMAP_UTIL_IMG) --label HOURLY_TAG=$(HOURLY_TAG_LABEL) --build-arg version=$(PROJECT_VERSION) --build-arg release=$(IMAGE_TAG) -f internal/remediation_config_utils_container/Dockerfile internal/remediation_config_utils_container

.PHONY: docker-push-remediation-configmap-util
docker-push-remediation-configmap-util: ## Push the docker image for remediation configmap util.
	$(CONTAINER_ENGINE) push $(REMEDIATION_CONFIGMAP_UTIL_IMG)

.PHONY: docker-save-remediation-configmap-util
docker-save-remediation-configmap-util: ## Save the docker image for remediation configmap util.
	$(CONTAINER_ENGINE) save $(REMEDIATION_CONFIGMAP_UTIL_IMG) | gzip > $(IMAGE_NAME)-remediation-configmap-util.tar.gz

>>>>>>> 3c7ef22f... Add CONTAINER_ENGINE to makefile (#1631)

Resolution: Added all three remediation-configmap-util targets from incoming commit

Cherry-pick triggered by: ACP-Automation