moving back to /opt/app in prod to precompile assets

Author: David Zuckerman

Dockerfile

@@ -180,6 +180,7 @@ RUN yarn build
 # Pre-compile assets so we don't have to do it after deployment.
 # NOTE: dummy SECRET_KEY_BASE to prevent spurious initializer issues
 #       -- see https://github.com/rails/rails/issues/32947
+WORKDIR /opt/app
 RUN SECRET_KEY_BASE=1 rails assets:precompile --trace
 
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