Enable otterdog for eclipse-arche

[netomi]

Ticket to keep track of the necessary steps to enable otterdog for the eclipse-<PROJECT_SHORT_NAME> project.

• Contacted project via https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/issues/<ISSUE_ID>
• Created bot user and added credentials to pass cbi repo
• Enable 2FA for bot user and add to pass
• Push credential to pass
• Configured bot user for the org to be the owner
• Created .eclipsefdn repo
• Added configuration for eclipse-<PROJECT_SHORT_NAME> to https://github.com/EclipseFdn/otterdog-configs/
• Added GitHub organization to PMI
• Installed Otterdog GitHub App

[fredg02]

The ArchE project had no activity in over a year. It has been reported to EMO for a potential termination review.