feat(rpm): Adding support for building a discovery-installer rpm

[abellotti]

• Add spec and supporting scripts to building a discovery-installer rpm
• Version as 1.8 for installer
• Pull 1.8 images (should be tagged with latest patch version)

Draft

• update README.md for RPM based usage
• add packit workflow
• create-server-password should check for server password restrictions
• support install time overrides (images, port, etc.)

NOTE:

• Before this can be merged, we need the upstream builds to automatically tag x.y for latest x.y.z quipucords container builds.
• This was done with feat(build): Create x.y release tags when building release containers quipucords#2663
• We'll wait for the new 1.8 so the x.y tag is available to pull in.

[abellotti]

Un-published Install time overrides can be provided with an optional configuration directory that the install will merge values when copying the container and env files.

The provided files will only include the values to overlay.

i.e.

discovery-installer install \
    --override-conf-dir ~/ci_quadlets_overlay.d

The optional directory will contain any of the files we need the installer to overlay (with just the data that needs changing), i.e:

- discovery-app.container
- discovery-celery-worker.container
- discovery-db.container
- discovery-redis.container
- discovery-server.container
- env-ansible.env
- env-app.env
- env-celery-worker.env
- env-db.env
- env-redis.env
- env-server.env

For example, specifying alternate images for versions to test or architecture, the override configuration directory would include:

discovery-server.container

[Container]
Image=quay.io/quipucords/quipucords:latest-arm64

discovery-app.container

[Container]
Image=quay.io/abellott/quipucords-ui:latest-arm64