Install otterdog app before setting it up

[netomi]

This is the root cause for the initial errors when enabling otterdog for an org:

Applying changes:

╷                                                                                                                                                                                                       
│ Error:   failed to apply patch: ADD - repo_ruleset[name="main", repository=.eclipsefdn]                                                                                                               
│          failed to add repo ruleset with name 'main':                                                                                                                                                 
│          Exception while accessing 'https://api.github.com/repos/eclipse-editdor/.eclipsefdn/rulesets': (status=422, body={"message":"Validation Failed","errors":["Invalid rule                      
│          'required_status_checks': Invalid parameter required_status_checks: Invalid integration                                                                                                      
│          ids"],"documentation_url":"https://docs.github.com/rest/repos/rules#create-a-repository-ruleset","status":"422"})                                                                            
╵                                                                                                                                                                                                       
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
  
  Done.

The reason is that during setup of otterdog for the org, a ruleset is created that references the otterdog app. If the app is not installed for the org, you will get a failure from the GH api.

Installing the app before setup should resolve that problem.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud