run yarn install as part of build

Author: anarchivist

Dockerfile

@@ -123,6 +123,9 @@ RUN gem install bundler --version 2.5.22
 COPY --chown=$APP_USER:$APP_USER Gemfile* ./
 RUN bundle install
 
+COPY --chown=$APP_USER:$APP_USER package.json yarn.lock ./
+RUN yarn install
+
 # Copy the rest of the codebase. We do this after bundle-install so that
 # changes unrelated to the gemset don't invalidate the cache and force a slow
 # re-install.

package.json

@@ -13,5 +13,6 @@
   "version": "0.1.0",
   "devDependencies": {
     "webpack-dev-server": "^3"
-  }
+  },
+  "packageManager": "yarn@1.22.22+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e"
 }