Pass informatica username/password into terraform and update docker image tags to be immutable

@JARED.KOSANOVIC @ERIC.SCHOVILLE

terraform/templates/container.tpl

@@ -18,6 +18,16 @@
         "containerPort": ${app_port3},
         "hostPort": ${app_port3}
       }
+    ],
+    "environment": [
+        {
+            "name": "INFORMATICA_USER",
+            "value": "${informatica_username}"
+        },
+        {
+            "name": "INFORMATICA_PASSWORD",
+            "value": "${informatica_password}"
+        }
     ]
   }
 ]
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