Use deployment script for docker images

+Fix deprecation warning of docker login

.travis.yml

@@ -30,11 +30,6 @@ after_success:
   - wget https://raw.githubusercontent.com/DiscordHooks/travis-ci-discord-webhook/master/send.sh
   - chmod +x send.sh
   - ./send.sh success $WEBHOOK_URL
-  - if [ $TRAVIS_BRANCH == "master" ] && [ $TRAVIS_EVENT_TYPE == "push" ]; then
-    docker login -u "$DOCKER_USERNAME" -p "$DOCKER_PASSWORD";
-    docker tag humanconnection/nitro-backend humanconnection/nitro-backend:latest;
-    docker push humanconnection/nitro-backend:latest;
-    fi
 
 after_failure:
   - wget https://raw.githubusercontent.com/DiscordHooks/travis-ci-discord-webhook/master/send.sh
@@ -42,6 +37,10 @@ after_failure:
   - ./send.sh failure $WEBHOOK_URL
 
 deploy:
+  - provider: script
+    script: scripts/docker_push.sh
+    on:
+      branch: master
   - provider: script
     script: scripts/deploy.sh nitro.human-connection.org
     on:

scripts/docker_push.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+docker push humanconnection/nitro-backend:latest