Mount a certificate folder to local ca storage in containers,
and add update command to cron image's entrypoint.
Result of poking and prodding from getsentry/sentry#26851
We used to build local images for Sentry services to be able to
include required plugins in the image. With this change we instead
do this in a custom entrypoint script and use the volume `/data`
to store the plugins permanently.
This should resolve many issues people have around building local
images and pushing them to places like private repositories or swarm
clusters.
This is not 100% compatible with the old way but it should still be
a mostly transparent change to many folks.
