Add jenkins

Jenkinsfile

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+pipeline {
+    agent any
+    environment {
+        OPENAI_API_KEY = credentials('OPENAI_API_KEY')
+        GITEA_TOKEN = credentials('GITEA_TOKEN')
+        GITEA_URL = 'https://git.jb9.uk'
+        CODEX_MODEL = 'gpt-4'
+        AI_REVIEW_FAIL_ON_FINDINGS = 'false'
+    }
+
+    stages {
+
+        stage ('AI Code review') {
+            steps {
+                sh 'python3 scripts/ai_code_review.py'
+            }
+        }
+
+    }
+}