Use a proper deploy stage for travis pushing to docker

.travis.yml

@@ -1,7 +1,17 @@
 language: node_js
 after_success:
   - npm run report
-  - sh docker/build.sh
 node_js:
   - '6'
   - '8'
+jobs:
+  include:
+    - stage: deploy
+      node_js: '8'
+      services:
+        - docker
+      deploy:
+        provider: script
+        script: bash docker/deploy.sh
+        on:
+          branch: master

docker/build.sh

@@ -1,14 +0,0 @@
-#!/bin/bash
-
-if [[ $TRAVIS_BRANCH == 'master' && $TRAVIS_PULL_REQUEST == 'false' ]]; then
-    echo "Connecting to docker hub"
-    echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
-
-    echo "Building..."
-    docker build -t reactiflux/discord-irc:latest -f docker/Dockerfile .
-
-    echo "Pushing image to Docker Hub..."
-    docker push reactiflux/discord-irc:latest
-else
-    echo "Skipping deploy; This is a PR or not on the master branch"
-fi

docker/deploy.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+echo "Connecting to docker hub"
+echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+
+echo "Building..."
+docker build -t reactiflux/discord-irc:latest -f docker/Dockerfile .
+
+echo "Pushing image to Docker Hub..."
+docker push reactiflux/discord-irc:latest