fix(scripts): stop gh-pages script from failing for pull requests

https://github.com/mozilla/fxa-email-service/pull/118
r=vladikoff

scripts/gh-pages.sh

@@ -6,24 +6,21 @@
 
 set -e
 
-[ "$TRAVIS_BRANCH" = master ]
+if [ "$TRAVIS_BRANCH" = "master" ] && [ "$TRAVIS_PULL_REQUEST" = "false" ]; then
+  eval key=\$encrypted_08b3d3de2dc6_key
+  eval iv=\$encrypted_08b3d3de2dc6_iv
 
-[ "$TRAVIS_PULL_REQUEST" = false ]
+  mkdir -p ~/.ssh
+  openssl aes-256-cbc -K $key -iv $iv -in scripts/id_rsa.enc -out ~/.ssh/id_rsa -d
+  chmod 600 ~/.ssh/id_rsa
 
-eval key=\$encrypted_08b3d3de2dc6_key
-eval iv=\$encrypted_08b3d3de2dc6_iv
-
-mkdir -p ~/.ssh
-openssl aes-256-cbc -K $key -iv $iv -in scripts/id_rsa.enc -out ~/.ssh/id_rsa -d
-chmod 600 ~/.ssh/id_rsa
-
-git clone --branch gh-pages git@github.com:mozilla/fxa-email-service.git docs
-
-cd docs
-git config user.name "fxa-devs"
-git config user.email "fxa-core@mozilla.com"
-rm -rf *
-mv ../target/doc/* .
-git add -A .
-git commit -qm "chore(docs): rebuild developer docs"
-git push -q origin gh-pages
+  git clone --branch gh-pages git@github.com:mozilla/fxa-email-service.git docs
+  cd docs
+  git config user.name "fxa-devs"
+  git config user.email "fxa-core@mozilla.com"
+  rm -rf *
+  mv ../target/doc/* .
+  git add -A .
+  git commit -qm "chore(docs): rebuild developer docs"
+  git push -q origin gh-pages
+fi