format-patch: add option to generate CC list
For git-format-patch(1), the --cc
option appends a specified email
address to be CC'd for all patches outputted. Additionally, via
format.cc
, CC recipients can be configured. A user may want to select
recipients in a more programatic manner though.
Introduce the --cc-cmd
flag and format.ccCmd
configuration to
optionally specify a program to execute and provide additional email
addresses to CC for each patch. The program is expected to output a
single email address per line of stdout.