Hotfix for error when missing SENTRY_DSN

Also I had to change in CI/CD how SENTRY_DSN was defined: no variable interpolation.

api/server.py

@@ -38,30 +38,31 @@ config = {
 for key, value in config.items():
     os.environ[key] = value or ""
 
-sentry_sdk.init(
-    dsn=os.environ["SENTRY_DSN", None],
-    # Set traces_sample_rate to 1.0 to capture 100%
-    # of transactions for performance monitoring.
-    traces_sample_rate=1.0,
-    # Set profiles_sample_rate to 1.0 to profile 100%
-    # of sampled transactions.
-    # We recommend adjusting this value in production.
-    profiles_sample_rate=1.0,
-    send_default_pii=False,  # send personally-identifiable information like LLM responses to sentry
-    integrations=[
-        StarletteIntegration(
-            transaction_style="url",
-            failed_request_status_codes=[403, range(500, 599)],
-        ),
-        FastApiIntegration(
-            transaction_style="url",
-            failed_request_status_codes=[403, range(500, 599)],
-        ),
-        LangchainIntegration(
-            include_prompts=False,
-        ),
-    ],
-)
+if "SENTRY_DSN" in os.environ:
+    sentry_sdk.init(
+        dsn=os.environ["SENTRY_DSN"],
+        # Set traces_sample_rate to 1.0 to capture 100%
+        # of transactions for performance monitoring.
+        traces_sample_rate=1.0,
+        # Set profiles_sample_rate to 1.0 to profile 100%
+        # of sampled transactions.
+        # We recommend adjusting this value in production.
+        profiles_sample_rate=1.0,
+        send_default_pii=False,  # send personally-identifiable information like LLM responses to sentry
+        integrations=[
+            StarletteIntegration(
+                transaction_style="url",
+                failed_request_status_codes=[403, range(500, 599)],
+            ),
+            FastApiIntegration(
+                transaction_style="url",
+                failed_request_status_codes=[403, range(500, 599)],
+            ),
+            LangchainIntegration(
+                include_prompts=False,
+            ),
+        ],
+    )
 
 
 class UnauthorizedMessage(BaseModel):