Container Scanning: Docker Exported Tarball (1/2)

[meghfossa]

Overview

This PR adds the ability to analyze exported docker tarball files.

Acceptance criteria

• When running --experiemental-scanner --output works for docker exported tarball
• When running --experiemental-scanner throws an error (since this requires CORE changes to be merged upstream)

Testing plan

docker save redis:alpine > redis.tar
fossa-dev container analyze redis.tar --experimental-scanner -o
fossa-dev container analyze redis.tar --experimental-scanner -o --debug # see the debug logs

Risks

None

References

https://fossa.atlassian.net/browse/ANE-276

Checklist

• I added tests for this PR's change (or explained in the PR description why tests don't make sense).
• If this PR introduced a user-visible change, I added documentation into docs/.
• If this change is externally visible, I updated Changelog.md. If this PR did not mark a release, I added my changes into an # Unreleased section at the top.
• If I made changes to .fossa.yml or fossa-deps.{json.yml}, I updated docs/references/files/*.schema.json. You may also need to update these if you have added/removed new dependency type (e.g. pip) or analysis target type (e.g. poetry).