Allow agent installation

[vicsufer]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions
• Remember to set idealista:develop as base branch;

Description of the Change

Attach agents to nexus.
Customize nexus.vmoptions file using a template instead of inline tasks.

Benefits

Allow the attachment of agents to nexus.

Allow easier development of the role, ensure idempotency of the role, allow overriding nexus.vmoptions from a playbook.

Possible Drawbacks

None

Applicable Issues

close #66
close #67