This commit cleans up the existing CI scripts a bit while adding jobs to
build RPM packages. The directory structure allows for easily adding more
package targets.
RPM outputs will only be uploaded on tagged commits.
Adds simple jobs for building the the Engine for Debian 10.
Pre-built docker images containing Sequoia will be pulled down and used
to build the Engine. Currently the Sequoia version is just the latest
from the `pep-engine` branch. We should make this selectable in the near
future.
Upon successful compilation an image containing the build output will be
pushed to an internal docker registry.