Stop building buildbox-fips

We do not use this buildbox for anything. This step is failing because
the supporting infrastructure for buildbox-fips was removed in
#26859.

.drone.yml

@@ -6236,29 +6236,6 @@ steps:
     path: /var/run
   - name: dockerconfig
     path: /root/.docker
-- name: Build and push buildbox-fips
-  image: docker
-  pull: if-not-exists
-  commands:
-  - apk add --no-cache make aws-cli
-  - chown -R $UID:$GID /go
-  - aws ecr get-login-password --profile staging --region=us-west-2 | docker login
-    -u="AWS" --password-stdin 146628656107.dkr.ecr.us-west-2.amazonaws.com
-  - make -C build.assets buildbox-fips
-  - docker tag public.ecr.aws/gravitational/teleport-buildbox-fips:$BUILDBOX_VERSION
-    146628656107.dkr.ecr.us-west-2.amazonaws.com/gravitational/teleport-buildbox-fips:$BUILDBOX_VERSION-$DRONE_COMMIT_SHA
-  - docker push 146628656107.dkr.ecr.us-west-2.amazonaws.com/gravitational/teleport-buildbox-fips:$BUILDBOX_VERSION-$DRONE_COMMIT_SHA
-  - docker logout 146628656107.dkr.ecr.us-west-2.amazonaws.com
-  - aws ecr-public get-login-password --profile production --region=us-east-1 | docker
-    login -u="AWS" --password-stdin public.ecr.aws
-  - docker push public.ecr.aws/gravitational/teleport-buildbox-fips:$BUILDBOX_VERSION
-  volumes:
-  - name: awsconfig
-    path: /root/.aws
-  - name: dockersock
-    path: /var/run
-  - name: dockerconfig
-    path: /root/.docker
 - name: Build and push buildbox-arm
   image: docker
   pull: if-not-exists
@@ -17230,6 +17207,6 @@ image_pull_secrets:
 - DOCKERHUB_CREDENTIALS
 ---
 kind: signature
-hmac: 91a2ca37bd7d648e1bebd19817df269bf4498c881d8e02c64105b78fb3121c68
+hmac: 868399aa03648c958bc0ce2922e6de2aeec47d7585bda2d40b5992d5bc091d27
 
 ...

dronegen/buildbox.go

@@ -52,8 +52,8 @@ func buildboxPipelineSteps() []step {
 
 	for _, name := range []string{"buildbox", "buildbox-arm", "buildbox-centos7"} {
 		for _, fips := range []bool{false, true} {
-			// FIPS is unsupported on ARM/ARM64
-			if name == "buildbox-arm" && fips {
+			// FIPS is only supported on centos7
+			if fips && name != "buildbox-centos7" {
 				continue
 			}
 			steps = append(steps, buildboxPipelineStep(name, fips))