feat: allow configuration of ACME certificates duration

docs/content/https/ref-acme.yaml

@@ -24,6 +24,14 @@ certificatesResolvers:
       #
       # caServer: "https://acme-staging-v02.api.letsencrypt.org/directory"
 
+      # The certificates' duration in hours.
+      # It defaults to 2160 (90 days) to follow Let's Encrypt certificates' duration.
+      #
+      # Optional
+      # Default: 2160
+      #
+      # certificatesDuration: 2160
+
       # Preferred chain to use.
       #
       # If the CA offers multiple certificate chains, prefer the chain with an issuer matching this Subject Common Name.