outgoing-cred-cmd is used to retrieve the password from a password
manager such as UNIX pass or bitwarden CLI. These tools often prompt for
a passphrase to secure the passwords and it is annoying having to enter
it every time sending an email with aerc.
Add a new option outgoing-cred-cmd-cache (default to true) to control
whether aerc will keep a cache of the password or run outgoing-cred-cmd
every time an email needs to be sent.
NB: If the cached password is incorrect, the only way to change it is to
restart aerc.
Fixes: ca90343850 ("outgoing-cred-cmd: delay execution until an email needs to be sent")
Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Moritz Poldrack <moritz@poldrack.dev>
abf6ec7f02