Building custom docker image for ARM64

thanks! appears to be working, unfortunately im building on a pi and im not sure it will finish in this lifetime (10hrs so far) :sweat_smile: i think ill have to set up an arm vm or something.

also, in the dockerfile i changed

#ARG JS_PLATFORM=linux/amd64
ARG JS_PLATFORM=linux/arm64/v8

and in the makefile

##@ Docker

TAG_SUFFIX=$(if $(WIRE_TAGS)!=oss,-$(WIRE_TAGS))
#PLATFORM=linux/amd64
PLATFORM=linux/arm64/v8