more fixes for website deploy

Summary:
we use `s3_website` to push the site to S3. turns out it doesn't support Java 11 yet (laurilehmijoki/s3_website#300) so I updated our docker image to use Java 8.

also fixed a deprecation warning about using `bundle install --path`, and fixed a related cwd issue with calling `bundle exec` from outside `website/`.

Reviewed By: jbrown215

Differential Revision: D21786250

fbshipit-source-id: 21e01836e6d2cc8b7e33aac992533f1a7153ecdc

.circleci/config.yml

@@ -81,7 +81,7 @@ executors:
     working_directory: /flow
   flow-website:
     docker:
-      - image: flowtype/flow-website:0.0.4
+      - image: flowtype/flow-website:0.0.5
     working_directory: ~/flow
   awscli:
     docker:
@@ -512,8 +512,9 @@ jobs:
     - run:
         name: Install gems
         command: |
-          cd website && \
-          bundle install --path vendor/bundle && \
+          cd website
+          bundle config set path 'vendor/bundle'
+          bundle install
           bundle exec s3_website install
     - save_cache:
         key: v2-gem-{{ arch }}-{{ .Branch }}-{{ checksum "website/Gemfile.lock" }}
@@ -524,7 +525,9 @@ jobs:
         command: PATH=~/flow/bin/linux:$PATH .circleci/build_website.sh
     - run:
         name: Publish website
-        command: bundle exec s3_website push --config-dir=website/ --site=dist/flow.org
+        command: |
+          cd website
+          bundle exec s3_website push --site=~/flow/dist/flow.org
 
   # deploys flow.js and the libdefs to Try Flow on release branches
   try_flow_deploy:

.circleci/images/website/Dockerfile

@@ -1,8 +1,11 @@
-FROM circleci/ruby:2.6-node
+# use Debian Stretch because it still provides jre8, which s3_website currently
+# needs. See https://github.com/laurilehmijoki/s3_website/issues/300 and
+# https://github.com/laurilehmijoki/s3_website/pull/329
+FROM circleci/ruby:2.6.6-stretch-node
 MAINTAINER Flow Team <flow@fb.com>
 
 # s3_website needs Java
-RUN sudo apt-get update && sudo apt-get install -y openjdk-11-jre-headless
+RUN sudo apt-get update && sudo apt-get install -y openjdk-8-jre-headless
 
 # install bundler 2.x
 RUN sudo gem update --system