chore(build): adds more reliable now deploy script (uber#832)

* feat: adds safer now deploy script

* fix: adds the master branch filter

.buildkite/pipeline.yml

@@ -43,8 +43,11 @@ steps:
     agents:
       queue: workers
   - name: ':now:'
-    branches: 'v*.*.*'
-    command: yarn documentation:build && yarn now --team=baseui --token=${ZEIT_NOW_TOKEN} && yarn now alias --team=baseui --token=${ZEIT_NOW_TOKEN}
+    branches: 'master'
+    command: ./scripts/now-deploy.sh
+    plugins:
+      'docker-compose':
+        run: baseui
     agents:
       queue: workers
   - name: ':screener:'

docker-compose.yml

@@ -82,4 +82,6 @@ services:
       - BUILDKITE_BUILD_URL
       - BUILDKITE_PROJECT_SLUG
       - BUILDKITE_COMMIT
+      - GITHUB_AUTH_TOKEN
       - SCREENER_API_KEY
+      - ZEIT_NOW_TOKEN

scripts/now-deploy.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -e
+
+# apt-get install -y jq
+
+this_commit=$(echo $BUILDKITE_COMMIT | tr -d '"')
+tags=$(curl https://api.github.com/repos/uber-web/baseui/git/refs/tags?access_token=${GITHUB_AUTH_TOKEN})
+latest_tagged_commit=$(echo $tags | jq '.[-1].object.sha' | tr -d '"')
+
+if [ "$this_commit" = "$latest_tagged_commit" ]; then
+  echo current commit matches latest tagged commit
+  echo deploying to now...
+
+  yarn documentation:build &&
+  yarn now --team=baseui --token=$ZEIT_NOW_TOKEN &&
+  yarn now alias --team=baseui --token=$ZEIT_NOW_TOKEN &&
+  yarn now rm baseui-documentation --safe --team=baseui --token=$ZEIT_NOW_TOKEN  --yes
+else
+  echo current commit does not match latest tagged commit
+  echo exited without deploying to now
+fi