Test Dockerfile improvements.
Test Dockerfile improvements.

Add tzdata package so timezone tests in command/restore work correctly.

Mark default git path as safe. This is a security fix that is not applicable in this environment, but must be set.

Also remove package cleanup, which is inconvenient when new packages need to be installed. It makes sense for containers that will be downloaded from Dockerhub but not so much for a locally-maintained container.

pgbackrest/pgbackrest,pgbackrest/pgbackrest,pgbackrest/pgbackrest