test(e2e): Add test for boundary connect postgres (#3671)

* refact(e2e): Rename env

* test(e2e): Add test for `connect postgres`

* fixup! test(e2e): Add test for `connect postgres`

enos/modules/test_e2e_docker/test.sh

@@ -13,7 +13,8 @@ apt update
 # unzip is used to unzip boundary.zip
 # pass is used to store the auth token from `boundary authenticate``
 # lsb-release is used for adding the hashicorp apt source
-apt install unzip pass lsb-release -y
+# postgresql is used for postgres tests
+apt install unzip pass lsb-release postgresql-client -y
 
 # Create a GPG key
 export KEY_PW=boundary