Add guacscanner

[jsf9k]

🗣 Description

This pull request modifies this Ansible role to allow for the addition of cisagov/guacscanner-docker to cisagov/guacamole-composition.

💭 Motivation and context

The functionality of cisagov/guacscanner-docker is necessary for the RPT UAT taking place in the COOL.

See also:

• cisagov/guacscanner/pull/1
• cisagov/guacscanner-docker#2
• cisagov/guacamole-composition#30
• cisagov/guacamole-packer#53
• cisagov/cool-assessment-terraform#149

🧪 Testing

I have applied these changes to env0 in our staging COOL environment and verified that they function as expected.

✅ Checklist

• [x] This PR has an informative and human-readable title.
• [x] Changes are limited to a single goal - eschew scope creep!
• [x] All relevant type-of-change labels have been added.
• [x] I have read the CONTRIBUTING document.
• [x] These code changes follow cisagov code standards.
• [x] All relevant repo and/or project documentation has been updated to reflect the changes in this PR.
• [x] Tests have been added and/or modified to cover the changes in this PR.
• [x] All new and existing tests pass.
• [x] Revert back to the main branch of cisagov/guacamole-composition once cisagov/guacamole-composition#30 is merged.

[jsf9k]

I also went a bit too far down the rabbit hole and found that the Dockerfile for guacamole/guacamole is installing a PostgreSQL JDBC driver that's over six years old. We should probably make an issue in the Apache JIRA to either fix it ourselves with a PR or at least get some attention on it I guess. The closest issue I could find was someone else having a problem in GUACAMOLE-1433 and another user mentions the JDBC driver needing an update.

Good idea. The old driver has already bitten us. See cisagov/guacamole-composition@8197d0e804a145a8dac67078b1e0a14c68e8e99d for more details.