Upgrade build-scripts to 3.4.0

This version fixes docker-compose health checks for dependent services. See
https://github.com/overleaf/dev-environment/pull/409 for details.

services/notifications/buildscript.txt

@@ -5,4 +5,4 @@ notifications
 --env-pass-through=
 --node-version=10.22.1
 --public-repo=True
---script-version=3.3.4
+--script-version=3.4.0

services/notifications/docker-compose.ci.yml

@@ -20,6 +20,7 @@ services:
     environment:
       ELASTIC_SEARCH_DSN: es:9200
       REDIS_HOST: redis
+      QUEUES_REDIS_HOST: redis
       MONGO_HOST: mongo
       POSTGRES_HOST: postgres
       MOCHA_GREP: ${MOCHA_GREP}
@@ -41,3 +42,7 @@ services:
     user: root
   mongo:
     image: mongo:4.0
+    healthcheck:
+      test: "mongo --quiet localhost/test --eval 'quit(db.runCommand({ ping: 1 }).ok ? 0 : 1)'"
+      interval: 1s
+      retries: 20

services/notifications/docker-compose.yml

@@ -25,6 +25,7 @@ services:
     environment:
       ELASTIC_SEARCH_DSN: es:9200
       REDIS_HOST: redis
+      QUEUES_REDIS_HOST: redis
       MONGO_HOST: mongo
       POSTGRES_HOST: postgres
       MOCHA_GREP: ${MOCHA_GREP}
@@ -39,4 +40,8 @@ services:
 
   mongo:
     image: mongo:4.0
+    healthcheck:
+      test: "mongo --quiet localhost/test --eval 'quit(db.runCommand({ ping: 1 }).ok ? 0 : 1)'"
+      interval: 1s
+      retries: 20