fix: Remove healthcheck as script type is not supported by nomads docker driver

modules/coder/jobspec.json

@@ -48,16 +48,7 @@
                                     "target": "/var/lib/postgresql/data",
                                     "source": "coder-data"
                                 }
-                            ],
-                            "healthcheck": {
-                                "test": [
-                                    "CMD-SHELL",
-                                    "pg_isready -U ${POSTGRES_USER:-username} -d ${POSTGRES_DB:-coder}"
-                                ],
-                                "interval": "5s",
-                                "timeout": "5s",
-                                "retries": 5
-                            }
+                            ]
                         },
                         "Env": {
                             "POSTGRES_USER": "${POSTGRES_USER:-username}",
@@ -100,4 +91,4 @@
             }
         ]
     }
-}
+}