Using different temporary keychains does not work if we do not set
`default_keychain=true`, because `codesign` then can't find the cert:
```
error: No signing certificate "iOS Distribution" found: No "iOS Distribution" signing certificate matching team ID
```
But if we set `default_keychain=true` then we cause a race condition
when the keychain is deleted by a parallel job while another is using it
as its default.
For this reason we have to use a static keychain name and keep it
between builds.
I tried disabling `default_keychain=true` in #11378 but it worked only
because the default user keychain already had the cert.
Signed-off-by: Jakub Sokołowski <jakub@status.im>
Signed-off-by: Andrea Maria Piana <andrea.maria.piana@gmail.com>
Jakub Sokołowski
0b8c673094