feat: add health server and prometheus metrics to worker

Gemfile.lock

@@ -193,6 +193,7 @@ GEM
     parallel (1.22.1)
     parser (3.2.1.1)
       ast (~> 2.4.1)
+    prometheus-client (4.2.2)
     public_suffix (5.0.4)
     puma (6.4.2)
       nio4r (~> 2.0)
@@ -314,6 +315,7 @@ GEM
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
+    webrick (1.8.1)
     websocket-driver (0.7.6)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
@@ -351,6 +353,7 @@ DEPENDENCIES
   nifty-utils
   nilify_blanks
   nio4r
+  prometheus-client
   puma
   rails (= 7.0.8.1)
   resolv
@@ -366,6 +369,7 @@ DEPENDENCIES
   turbolinks (~> 5)
   uglifier (>= 1.3.0)
   webmock
+  webrick
 
 BUNDLED WITH
    2.5.6