Merge pull request #7557 from kaovilai/detectPodmanEmulation

Add notes for podman / colima usage on macOS

Makefile

@@ -74,8 +74,18 @@ else
 	GCR_IMAGE_TAGS ?= $(GCR_IMAGE):$(VERSION)
 endif
 
+# check buildx is enabled
+# macOS/Windows docker cli without Docker Desktop license: https://github.com/abiosoft/colima
+# To add buildx to docker cli: https://github.com/abiosoft/colima/discussions/273#discussioncomment-2684502
 ifeq ($(shell docker buildx inspect 2>/dev/null | awk '/Status/ { print $$2 }'), running)
 	BUILDX_ENABLED ?= true
+# if emulated docker cli from podman, assume enabled
+# emulated docker cli from podman: https://podman-desktop.io/docs/migrating-from-docker/emulating-docker-cli-with-podman
+# podman known issues:
+# - on remote podman, such as on macOS,
+#   --output issue: https://github.com/containers/podman/issues/15922
+else ifeq ($(shell cat $(shell which docker) | grep -c "exec podman"), 1)
+	BUILDX_ENABLED ?= true
 else
 	BUILDX_ENABLED ?= false
 endif