An example how to manage local private key using env

[miohtama]

How to manage private keys using environment variable, how to generate them, and some security warnings.

What was wrong?

Managing local private keys w/current best practices was not well explained.

How was it fixed?

Added a new section in the docs with a code example and warnings.

Cute Animal Picture

Art by John Eidson

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              ~(^^^^)~
               ) @@ \~_          |\
              /     | \        \~ /
             ( 0  0  ) \        | |       Hey
              ---___/~  \       | |           Hiya
               /'__/ |   ~-_____/ |                Doin?
o          _   ~----~      ___---~
  O       //     |         |
         ((~\  _|         -|                Oops! I mean MOOOOOOO
   o  O //-_ \/ |        ~  |
        ^   \_ /         ~  |
               |          ~ |
               |     /     ~ |
               |     (       |
                \     \      /\               -John Eidson-
               / -_____-\   \ ~~-*
               |  /       \  \       .==.
               / /         / /       |  |
             /~  |      //~  |       |__|
             ~~~~        ~~~~

[wolovim]

Important context! Thanks for submitting 🤝
I'll add a newsfragment and any nits then pull it in.