Use CGO to enable boringssl

Makefile

@@ -1,5 +1,5 @@
 PACKAGE_NAME?=github.com/projectcalico/pod2daemon
-GO_BUILD_VER?=v0.53
+GO_BUILD_VER?=v0.58
 
 ORGANIZATION=projectcalico
 SEMAPHORE_PROJECT_ID?=$(SEMAPHORE_POD2DAEMON_PROJECT_ID)
@@ -39,6 +39,13 @@ include Makefile.common
 
 ###############################################################################
 
+# We need CGO to leverage Boring SSL.  However, the cross-compile doesn't support CGO yet.
+ifeq ($(ARCH), $(filter $(ARCH),amd64))
+CGO_ENABLED=1
+else
+CGO_ENABLED=0
+endif
+
 SRC_FILES=$(shell find -name '*.go')
 
 .PHONY: clean
@@ -72,7 +79,7 @@ bin/flexvol-armv7: ARCH=armv7
 bin/flexvol-ppc64le: ARCH=ppc64le
 bin/flexvol-s390x: ARCH=s390x
 bin/flexvol-%: $(SRC_FILES)
-	$(DOCKER_RUN) $(CALICO_BUILD) go build -v -o bin/flexvol-$(ARCH) flexvol/flexvoldriver.go
+	$(DOCKER_RUN) -e CGO_ENABLED=$(CGO_ENABLED) $(CALICO_BUILD) go build -v -o bin/flexvol-$(ARCH) flexvol/flexvoldriver.go
 
 ###############################################################################
 # Building the image