update drone yml to use cloudflare for acme challenge [ci skip]

.drone.yml

@@ -90,6 +90,10 @@ steps:
       TF_VAR_prod: "true"
       TECHNITIUM_API_KEY:
         from_secret: TECHNITIUM_API_KEY
+      CLOUDFLARE_TOKEN:
+        from_secret: CLOUDFLARE_TOKEN
+      CLOUDFLARE_ZONE_ID:
+        from_secret: CLOUDFLARE_ZONE_ID
     commands:
       - "apk update && apk add git certbot expect curl gzip wget"
       # Install terraform cli