add dedicated script for setting up mastodon deps (#336)

.travis.yml

@@ -40,18 +40,8 @@ services:
   - redis-server
 before_install:
   - npm install -g npm@5
-  - rvm install 2.5.0
-  - rvm use 2.5.0
-  - sudo -E add-apt-repository -y ppa:mc3man/trusty-media
-  - sudo -E apt-get update
-  - sudo -E apt-get install -y ffmpeg
-  - ruby --version
-  - node --version
-  - npm --version
-  - postgres --version
-  - redis-server --version
-  - ffmpeg -version
   - npm install -g greenkeeper-lockfile@1
+  - ./bin/setup-mastodon-in-travis.sh
 before_script:
   - npm run lint
   - greenkeeper-lockfile-update

bin/setup-mastodon-in-travis.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+
+if [[ "$COMMAND" = deploy-dev-travis ]]; then
+  exit 0 # no need to setup mastodon in this case
+fi
+
+rvm install 2.5.0
+rvm use 2.5.0
+sudo -E add-apt-repository -y ppa:mc3man/trusty-media
+sudo -E apt-get update
+sudo -E apt-get install -y ffmpeg
+ruby --version
+node --version
+npm --version
+postgres --version
+redis-server --version
+ffmpeg -version