Rework how the clean build command works.

Makefile

@@ -6,8 +6,8 @@ build: dist/hff-entry-forms-api.tar.gz dist/hff-entry-forms-web.tar.gz
 clean:
 	-rm -r dist
 	-rm -r web/dist
-	-docker container prune
-	-docker image prune
+	make -C api clean
+	make -C web clean
 
 update-version:
 	operations/update-version.sh

api/Makefile

@@ -69,6 +69,9 @@ serve-docker: build-image
 # Utility
 # -------
 
+clean:
+	-docker image rm $(ECR_ACCOUNT_URL)/hff_entry_forms_api:$(VERSION)
+
 # Authenticate docker to the AWS private elastic container repository.
 ecr-auth:
 	aws ecr get-login-password --region us-west-2 | docker login --username AWS --password-stdin $(ECR_ACCOUNT_URL)

web/Makefile

@@ -3,3 +3,6 @@ build:
 
 serve:
 	npm run serve
+
+clean:
+	-rm -r dist