perf: avoid needless downloads and track request latency (#876)

* perf: avoid needless downloads and track request latency

* fix: correct request timing and monitoring revalidation

docker-compose.yml

@@ -1,5 +1,10 @@
 services:
   anonymous_github:
+    logging:
+      driver: json-file
+      options:
+        max-size: "25m"
+        max-file: "4"
     build: .
     restart: always
     image: tdurieux/anonymous_github:v2
@@ -36,6 +41,11 @@ services:
         condition: service_healthy
 
   streamer:
+    logging:
+      driver: json-file
+      options:
+        max-size: "25m"
+        max-file: "4"
     build: .
     restart: always
     image: tdurieux/anonymous_github:v2