[9.x] Allow to pass base64 key to env:encrypt command

[ekateiva]

The idea is described in #45155

The thing is that it is not possible now to reuse automatically generated base64 key by env:encrypt (when --key option is not passed) for further encryptions of .env file:

php artisan env:encrypt --env=staging --force --key=base64:74yqwbohnT2S9UFILYaDv73lZTqiDBeUDvyWHT6V0pw=
>    ERROR  Unsupported cipher or incorrect key length. Supported ciphers are: aes-128-cbc, aes-256-cbc, aes-128-gcm, aes-256-gcm.

And you would like to reuse the same encryption key between developers working on the same project and who needs to modify the .env (e.g. staging, production, etc.) files.

Fixes #45155

[joedixon]

Thanks @ekateiva, this is a really nice addition and something I've been considering for a while.

I just simplified the PR a little - let me know if you have any feedback.

[ekateiva]

@joedixon Thanks for simplifying it... Looks good to me! 👍