Update .env.example with default values and add gitleaks configuration (#279)

Author: Adityav369

.env.example

@@ -4,17 +4,17 @@ SESSION_SECRET_KEY="your-session-secret-key-change-in-production"
 POSTGRES_URI="postgresql+asyncpg://morphik:morphik@localhost:5432/morphik"
 
 # LLM Provider API Keys (set the ones you use)
-OPENAI_API_KEY=""
-ANTHROPIC_API_KEY=""
-GEMINI_API_KEY=""
+OPENAI_API_KEY=
+ANTHROPIC_API_KEY=
+GEMINI_API_KEY=
 
 # Optional
-AWS_ACCESS_KEY=""
-AWS_SECRET_ACCESS_KEY=""
-ASSEMBLYAI_API_KEY=""
-MORPHIK_EMBEDDING_API_KEY=""
-MORPHIK_GRAPH_API_KEY=""
-TURBOPUFFER_API_KEY=""
-SENTRY_DSN=""
-LOCAL_URI_PASSWORD=""
-LITELLM_DUMMY_API_KEY=""
+AWS_ACCESS_KEY=
+AWS_SECRET_ACCESS_KEY=
+ASSEMBLYAI_API_KEY=
+MORPHIK_EMBEDDING_API_KEY=
+MORPHIK_GRAPH_API_KEY=
+TURBOPUFFER_API_KEY=
+SENTRY_DSN=
+LOCAL_URI_PASSWORD=
+LITELLM_DUMMY_API_KEY=

.gitleaks.toml

@@ -0,0 +1,7 @@
+[extend]
+useDefault = true
+
+[allowlist]
+paths = [
+    '''^\.env\.example$''',
+]