make: date -uR produced a comma that was misinterpreted in go_$*_ldflags

Using set -x, I noticed that LDFLAGS= was being split on the commas:

 + LDFLAGS='-X version.Commit=6b3b365dbf4a3a907b6fd97d745efbd889afde0f -X version.BuildDate=Thu,'
 + 26 Sep 2024 14:34:51 '+0000 -X client.ClientID=k3TrDbfLhCgnpAbOiiT2kIE1AbovKzjo

To fix this, I've decided to print the date without spaces or special
chars.

Before, it looked like this:
  Fri, 27 Sep 2024 10:15:10 +0000
Now, it looks like this:
  2024-09-27-12:15:16-CEST

Author: maelvls

make/00_mod.mk

@@ -13,7 +13,7 @@ go_preflight_mod_dir := .
 go_preflight_ldflags := \
 	-X $(repo_name)/pkg/version.PreflightVersion=$(VERSION) \
 	-X $(repo_name)/pkg/version.Commit=$(GITCOMMIT) \
-	-X $(repo_name)/pkg/version.BuildDate="$(shell date -uR)" \
+	-X $(repo_name)/pkg/version.BuildDate="$$(date -uR)" \
 	-X $(repo_name)/pkg/client.ClientID="k3TrDbfLhCgnpAbOiiT2kIE1AbovKzjo" \
 	-X $(repo_name)/pkg/client.ClientSecret="f39w_3KT9Vp0VhzcPzvh-uVbudzqCFmHER3Huj0dvHgJwVrjxsoOQPIw_1SDiCfa" \
 	-X $(repo_name)/pkg/client.AuthServerDomain="auth.jetstack.io"
@@ -43,4 +43,4 @@ $(YQ) \
 	$1 --inplace
 endef
 
-go_header_file := /dev/null
+go_header_file := /dev/null

make/test-unit.mk

@@ -1,7 +1,7 @@
 .PHONY: test-unit
 ## Unit tests
 ## @category Testing
-test-unit: | $(NEEDS_GO) $(NEEDS_GOTESTSUM) $(ARTIFACTS)
+test-unit: | $(NEEDS_GO) $(NEEDS_GOTESTSUM) $(ARTIFACTS) $(NEEDS_ETCD) $(NEEDS_KUBE-APISERVER)
 	$(GOTESTSUM) \
 		--junitfile=$(ARTIFACTS)/junit-go-e2e.xml \
 		-- \
@@ -10,4 +10,5 @@ test-unit: | $(NEEDS_GO) $(NEEDS_GOTESTSUM) $(ARTIFACTS)
 		-- \
 		-ldflags $(go_preflight_ldflags)
 
+    export KUBEBUILDER_ASSETS=$(CURDIR)/$(bin_dir)/tools
 	$(GO) tool cover -html=$(ARTIFACTS)/filtered.cov -o=$(ARTIFACTS)/filtered.html