Read p12-password from env or stdin

[jamie-pate]

Other secret arguments have variants like --remote-shared-secret-env <ENV VAR NAME> and --smartcard-pin-env <STRING> so it would make sense to add an argument --p12-password-env which reads from that environment variable..

Another way to pass in the secret without writing to disk is by stdin, but that's also doesn't work. By convention passing a file named - reads from stdin:

rcodesign analyze-certificate --p12-file ../empty/developer_key <<<"$DEVELOPER_KEY_PWD"
nalyze-certificate --p12-file ../empty/developer_key <<<"$DEVELOPER_KEY_PWD"
Please enter password for p12 file: 

rcodesign analyze-certificate --p12-file ../empty/developer_key --p12-password-file - <<<"$DEVELOPER_KEY_PWD" 
DEVELOPER_KEY_PWD" --p12-file ../empty/developer_key --p12-password-file - <<<"$D
Error: I/O error: No such file or directory (os error 2)

This works on linux, because /dev/stdin is available there: rcodesign analyze-certificate --p12-file ../empty/developer_key --p12-password-file /dev/stdin <<<"$DEVELOPER_KEY_PWD"