fix(build): uname handling for mac M1 arch. Fixes #13112 (#13113)

Co-authored-by: Anton Gilgur <agilgur5@gmail.com>
Signed-off-by: Adrien Delannoy <a.delannoyfr@gmail.com>

Makefile

@@ -25,7 +25,7 @@ SRC                   := $(GOPATH)/src/github.com/argoproj/argo-workflows
 # docker image publishing options
 IMAGE_NAMESPACE       ?= quay.io/argoproj
 DEV_IMAGE             ?= $(shell [ `uname -s` = Darwin ] && echo true || echo false)
-TARGET_PLATFORM := $(shell [ `uname -m` = arm64 ] && echo linux/arm64 || echo linux/amd64)
+TARGET_PLATFORM       ?= linux/$(shell go env GOARCH)
 
 # declares which cluster to import to in case it's not the default name
 K3D_CLUSTER_NAME      ?= k3s-default
@@ -732,7 +732,7 @@ docs: /usr/local/bin/mkdocs \
 	# check environment-variables.md contains all variables mentioned in the code
 	./hack/docs/check-env-doc.sh
 	# build the docs
-	mkdocs build --strict
+	TZ=UTC mkdocs build --strict
 	# tell the user the fastest way to edit docs
 	@echo "ℹ️ If you want to preview your docs, open site/index.html. If you want to edit them with hot-reload, run 'make docs-serve' to start mkdocs on port 8000"