Do not pin invocation image to a specific debian release #2745
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What does this change
Use stable instead of a specific debian release, so that when the release is archived, we don't end up with an unbuildable bundle. If a user wants to pin to a base image, they should use a custom Dockerfile. Porter should default to a release (stable) that will always work, so that porter doesn't need to be recompiled or a new version installed because a debian release was archived.
What issue does it fix
Fixes #2744
Notes for the reviewer
N/A
Checklist
Reviewer Checklist