* Add tiny Bash wrapper to check for Node before attempting to execute Heroku release script
* Use the wrapper script for the Heroku release command
* Be explicit about exiting with Node's exit code
* If Node is missing, exit using that script's exit code
* Create a release script to soft-purge all rendered pages from the Redis cache
* Set NODE_ENV
* Pass the Redis database number as an option rather than in the URL
* Change key scanning pattern based on Heroku metadata presence
* Shorten purge TTL to 30 minutes
* Only fail hard on Heroku production releases
* Don't return TOO early or else we forget to resume the scanStream!
* Correct ioredis command casing to all lowercase
* Add unexpectedly necessary exit
* Tweak wording of dry run logging
* Add some polish
* Prevent accidental soft-purging of the current release's keys
* Simplify the key check
* Fix lint error