[New Rule] Github Repository Deleted (#3056)

* new rule

* Update rules/integrations/github/impact_github_repository_deleted.toml

* Update rules/integrations/github/impact_github_repository_deleted.toml

updates based on review

Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>

---------

Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>

rules/integrations/github/impact_github_repository_deleted.toml

@@ -0,0 +1,47 @@
+[metadata]
+creation_date = "2023/08/29"
+integration = ["github"]
+maturity = "production"
+min_stack_comments = "New fields added: required_fields, related_integrations, setup"
+min_stack_version = "8.3.0"
+updated_date = "2023/08/29"
+
+[rule]
+author = ["Elastic"]
+description = """
+This rule detects when a GitHub repository is deleted within your organization. 
+Repositories are a critical component used within an organization to manage work, 
+collaborate with others and release products to the public. Any delete action against 
+a repository should be investigated to determine it's validity. Unauthorized deletion 
+of organization repositories could cause irreversible loss of intellectual property and 
+indicate compromise within your organization.
+"""
+from = "now-9m"
+index = ["logs-github.audit-*"]
+language = "eql"
+license = "Elastic License v2"
+name = "GitHub Repository Deleted"
+risk_score = 47
+rule_id = "345889c4-23a8-4bc0-b7ca-756bd17ce83b"
+severity = "medium"
+tags = ["Domain: Cloud", "Use Case: Threat Detection", "Tactic: Impact", "Data Source: Github"]
+timestamp_override = "event.ingested"
+type = "eql"
+query = '''
+configuration where event.module == "github" and event.action == "repo.destroy"
+'''
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1485"
+name = "Data Destruction"
+reference = "https://attack.mitre.org/techniques/T1485/"
+
+
+
+[rule.threat.tactic]
+id = "TA0040"
+name = "Impact"
+reference = "https://attack.mitre.org/tactics/TA0040/"
+