Important fixes and smaller Debian packages

This is a release with important bug fixes and reliability issues, and improves the packaging operations.

The main issue this fixes is the "Too many open files" issue some operators encountered.
It also fixes reliability issues in persistent volumes that were not properly synced before the shutdown of the VM.

A test runtime rootfs is not included in the packages anymore, bringing package sizes back to an acceptable size of 13.5 MB instead of ~200 MB. Package version numbers are automatically generated from Git.

What's Changed

• Fix: Redis connections were accumulating by @hoh in #111
• Fix: A directory with the numerical id of the VM was not deleted by @hoh in #113
• Feature: Admin could not distinguish guest_api among running processes by @hoh in #112
• Internal: Package firecracker was not mounted in development container by @hoh in #114
• Fix: VM were not properly shutdowm, persistent volumes could be corrupted by @hoh in #115
• Feature: Publish artifacts from GH actions by @hoh in #117

Full Changelog: 0.1.7...0.1.8