Remove unused FIPS build boxes (#26859)

FIPS is only built on amd64, and only on our centos:7 buildboxes.  These
other dockerfiles and targets are vestigial.  Furthermore, the buildbox
is a security risk, as ubuntu:18.04 is not supported after 2023-05-31.

If/when we want to support FIPS on ARM, we can build off the centos:7
infrastructure, or its successor.

build.assets/Makefile

@@ -161,20 +161,7 @@ buildbox:
 # Builds a Docker buildbox for FIPS
 #
 .PHONY:buildbox-fips
-buildbox-fips:
-	if [[ "$(BUILDBOX_FIPS_NAME)" == "$(BUILDBOX_FIPS)" ]]; then \
-		if [[ $${DRONE} == "true" ]] && ! docker inspect --type=image $(BUILDBOX_FIPS) 2>&1 >/dev/null; then docker pull $(BUILDBOX_FIPS) || true; fi; \
-		docker build \
-			--build-arg UID=$(UID) \
-			--build-arg GID=$(GID) \
-			--build-arg BUILDARCH=$(RUNTIME_ARCH) \
-			--build-arg GOLANG_VERSION=$(GOLANG_VERSION) \
-			--build-arg NODE_VERSION=$(NODE_VERSION) \
-			--build-arg RUST_VERSION=$(RUST_VERSION) \
-			--build-arg LIBBPF_VERSION=$(LIBBPF_VERSION) \
-			--cache-from $(BUILDBOX_FIPS) \
-			--tag $(BUILDBOX_FIPS) -f Dockerfile-fips . ; \
-	fi
+buildbox-fips: buildbox-centos7-fips
 
 #
 # Builds a Docker buildbox for CentOS 7 builds
@@ -226,20 +213,6 @@ buildbox-arm: buildbox
 		--cache-from $(BUILDBOX_ARM) \
 		--tag $(BUILDBOX_ARM) -f Dockerfile-arm .
 
-#
-# Builds a Docker buildbox for ARMv7/ARM64 FIPS builds
-# ARM buildboxes use a regular Teleport buildbox as a base which already has a user
-# with the correct UID and GID created, so those arguments are not needed here.
-#
-.PHONY:buildbox-arm-fips
-buildbox-arm-fips: buildbox-fips
-	@if [[ $${DRONE} == "true" ]] && ! docker inspect --type=image $(BUILDBOX_ARM_FIPS) 2>&1 >/dev/null; then docker pull $(BUILDBOX_ARM_FIPS) || true; fi;
-	docker build \
-		--build-arg BUILDBOX_VERSION=$(BUILDBOX_VERSION) \
-		--cache-from $(BUILDBOX_FIPS) \
-		--cache-from $(BUILDBOX_ARM_FIPS) \
-		--tag $(BUILDBOX_ARM_FIPS) -f Dockerfile-arm-fips .
-
 CONNECT_VERSION ?= $(VERSION)
 ifeq ($(CONNECT_VERSION),)
 CONNECT_VERSION := $(BUILDBOX_VERSION)-dev
@@ -428,8 +401,7 @@ release-amd64:
 	$(MAKE) release ARCH=amd64 FIDO2=yes
 
 .PHONY: release-amd64-fips
-release-amd64-fips:
-	$(MAKE) release-fips ARCH=amd64 FIPS=yes BUILDBOX_FIPS_NAME=$(BUILDBOX_FIPS)
+release-amd64-fips: release-amd64-centos7-fips
 
 .PHONY: release-386
 release-386:

build.assets/images.mk

@@ -6,11 +6,9 @@ BUILDBOX_VERSION ?= teleport14
 BUILDBOX_BASE_NAME ?= public.ecr.aws/gravitational/teleport-buildbox
 
 BUILDBOX=$(BUILDBOX_BASE_NAME):$(BUILDBOX_VERSION)
-BUILDBOX_FIPS=$(BUILDBOX_BASE_NAME)-fips:$(BUILDBOX_VERSION)
 BUILDBOX_CENTOS7=$(BUILDBOX_BASE_NAME)-centos7:$(BUILDBOX_VERSION)
 BUILDBOX_CENTOS7_FIPS=$(BUILDBOX_BASE_NAME)-centos7-fips:$(BUILDBOX_VERSION)
 BUILDBOX_ARM=$(BUILDBOX_BASE_NAME)-arm:$(BUILDBOX_VERSION)
-BUILDBOX_ARM_FIPS=$(BUILDBOX_BASE_NAME)-arm-fips:$(BUILDBOX_VERSION)
 BUILDBOX_UI=$(BUILDBOX_BASE_NAME)-ui:$(BUILDBOX_VERSION)
 BUILDBOX_CONNECT=$(BUILDBOX_BASE_NAME)-connect:$(BUILDBOX_VERSION)
 BUILDBOX_CENTOS7_ASSETS=$(BUILDBOX_BASE_NAME)-centos7-assets:$(BUILDBOX_VERSION)