feat(Docker): make shell

Co-authored-by: Ikenna Omekam <ikenna@agoric.com>

packages/deployment/upgrade-test/Makefile

@@ -69,4 +69,7 @@ run_test:
 run_bash:
 	$(RUN) --entrypoint /bin/bash $(REPOSITORY):$(dockerLabel)
 
+shell:
+	docker exec -it `docker ps --latest --format json | jq -r .Names` bash
+
 .PHONY: local_sdk agoric-upgrade-7-2 agoric-upgrade-8 agoric-upgrade-8-1 agoric-upgrade-9 agoric-upgrade-10 agoric-upgrade-11 agoric-upgrade-12 build build_test run

packages/deployment/upgrade-test/Readme.md

@@ -41,7 +41,9 @@ make run
 
 This will start a container with the output of chain start.
 
-To get a shell use `docker exec -it`. For more info: https://phase2.github.io/devtools/common-tasks/ssh-into-a-container/
+To get a shell: `make shell`
+
+  For more info: https://phase2.github.io/devtools/common-tasks/ssh-into-a-container/
 
 The container and chain will halt once you detach from the session.
 
@@ -88,6 +90,11 @@ If when reattaching you get a log tail, you need to start a new TTY (with the co
 docker exec -it sweet_edison bash
 ```
 
+or just use this helper,
+```
+make shell
+```
+
 
 **To test GUI**