Update common Prometheus files (#896)

Signed-off-by: prombot <prometheus-team@googlegroups.com>

Author: prombot

Makefile.common

@@ -90,7 +90,9 @@ ifdef DOCKERFILE_PATH
 $(error DOCKERFILE_PATH is deprecated. Use DOCKERFILE_VARIANTS ?= $(DOCKERFILE_PATH) in the Makefile)
 endif
 
-DOCKER_ARCHS            ?= amd64
+DOCKER_ARCHS ?= amd64 armv7 arm64 ppc64le riscv64 s390x
+DOCKERFILE_ARCH_EXCLUSIONS ?=
+DOCKER_REGISTRY_ARCH_EXCLUSIONS ?= quay.io:riscv64
 DOCKERFILE_VARIANTS     ?= $(wildcard Dockerfile Dockerfile.*)
 
 # Function to extract variant from Dockerfile label.