Use of % in SMTP Password for discourse-setup

I used a % as a special character in my SMTP password. This caused a control character to be created in the app.yml file that caused the following errors

(): control characters are not allowed at line 1 column 1 -e LANG=en_US.UTF-8 
YAML syntax error. Please check your containers/*.yml config files. 

I tried rerunning discourse-setup and it kept failing.

Eventually the data field in the app.yml file looked like this:

DISCOURSE_SMTP_PASSWORD: "74 DISCOURSE_SMTP_PASSWORD: "74% DISCOURSE_SMTP_PASSWORD: 74%DISCOURSE_SMTP_PASSWORD: 7e[3~e[3~e[3~e[3~e[3~74%DISCOURSE_SMTP_PASSWORD: pa$$word......"

To resolve I had to manually edit the app.yml file to remove all the bad data and had to remove the % sign from my password. The setup than ran smoothly and allowed the setup of a new discourse install.

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