* Enable 'secure' option for pwgen
As per the [pwgen manual](https://linux.die.net/man/1/pwgen, "pwgen manual"), the "-s"(secure) option instructs pwgen to generate completely random passwords, where as the default for pwgen is to generate more memorable passwords. Since, the passwords generated in this part of the installation process are to be "remembered" by the dot env file, I believe that users may benefit from the additional entropy provided by the "-s" option in pwgen.
* Enable 'secure' option for pwgen
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