fix(.env): add SIMULATE_ATTESTATION env variable

Author: magurh

.env.example

@@ -1,6 +1,9 @@
 # GEMINI API key
 GEMINI_API_KEY=YOUR_API_KEY
 
+# Simulating attestation (pre-TEE deployment)
+SIMULATE_ATTESTATION=false
+
 # For TEE deployment only
 TEE_IMAGE_REFERENCE=ghcr.io/flare-foundation/flare-ai-rag:main
 INSTANCE_NAME=PROJECT_NAME-TEAM-_NAME