carto/protobuf @ php-ignore-enum

Adam Cozzette 802e1b99b2 Attempt to mitigate "docker pull" failures		%!s(int64=5) %!d(string=hai) anos
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build.sh	802e1b99b2 Attempt to mitigate "docker pull" failures	%!s(int64=5) %!d(string=hai) anos
continuous.cfg	0871e6a808 Add continuous testing config files for Kokoro	%!s(int64=8) %!d(string=hai) anos
presubmit.cfg	6156af10e8 Add MacOS and Linux tests to Kokoro	%!s(int64=8) %!d(string=hai) anos