Codesign identity as optional parameter

[Dominik Minta]

For two Developer ID distribution certificates installed on my machine (both from different teams) I receive following warning:

Code signing failed. The DMG is fine, just not code signed.
Developer ID Application: ambiguous (matches "Developer ID Application: OrganizationA (XXXXXXXXXX)" and "Developer ID Application: OrganizationB (YYYYYYYYY)" in /Users/user/Library/Keychains/login.keychain-db)
XXXXXXXXXX

It would be nice to have an optional parameter to resolve this issue, for example:

--identity "Developer ID Application: OrganizationB (YYYYYYYYY)"

[Sindre Sorhus]

Sure. PR welcome.