build(Makefile): Reattach container that are meant to be foreground.

Makefile

@@ -16,6 +16,10 @@ export CONTAINER_FILE
 export CF_PREFIX
 export DEVELOP
 export MOUNT_DIR=/mnt/fradrive
+# CONTAINER_RUNMODE variants:
+#   detached: detached container
+#   attached: attached container
+export CONTAINER_RUNMODE ?= detached
 
 export SERVICE
 export SERVICE_VARIANT ?= $(SERVICE)
@@ -130,16 +134,19 @@ start-%: --act ;
 .PHONY: compile-%
 compile-%: JOB=compile
 compile-%: CF_PREFIX = "compile-"
+compile-%: CONTAINER_RUNMODE = "attached"
 compile-%: --act ;
 
 .PHONY: test-%
 test-%: JOB=test
 test-%: CF_PREFIX = "test-"
+test-%: CONTAINER_RUNMODE = "attached"
 test-%: --act ;
 
 .PHONY: lint-%
 lint-%: JOB=lint
 lint-%: CF_PREFIX = "lint-"
+lint-%: CONTAINER_RUNMODE = "attached"
 lint-%: --act ;
 
 --act: --develop_containerized;
@@ -197,7 +204,10 @@ endif
 	  --name $${CONTAINER_NAME} \
 	  $(CONTAINER_CMD) \
 	` ; \
-	printf "CONTAINER_ID=$${CONTAINER_ID}" >> "$(CONTAINER_FILE)"
+	printf "CONTAINER_ID=$${CONTAINER_ID}" >> "$(CONTAINER_FILE)" ; \
+	if [[ "attached" -eq $(CONTAINER_RUNMODE) ]] ; then \
+	  $(CONTAINER_COMMAND) attach $${CONTAINER_ID} ; \
+	fi
 
 # HELP(start-backend): start yesod-devel instance
 --start-backend: