feat: add migration guide and example migration script

.env.example

@@ -34,15 +34,15 @@ DELIVERYMQ_MAX_CONCURRENCY=1
 TOPICS="user.created,user.updated,user.deleted" # comma separated list of topics to subscribe to, replace with your own topics
 
 # Webhook Destination
-# DESTINATION_WEBHOOK_HEADER_PREFIX="x-outpost-"
-# DESTINATION_WEBHOOK_DISABLE_DEFAULT_EVENT_ID_HEADER=false
-# DESTINATION_WEBHOOK_DISABLE_DEFAULT_SIGNATURE_HEADER=false
-# DESTINATION_WEBHOOK_DISABLE_DEFAULT_TIMESTAMP_HEADER=false
-# DESTINATION_WEBHOOK_DISABLE_DEFAULT_TOPIC_HEADER=false
-# DESTINATION_WEBHOOK_SIGNATURE_CONTENT_TEMPLATE={{.Timestamp.Unix}}.{{.Body}}
-# DESTINATION_WEBHOOK_SIGNATURE_HEADER_TEMPLATE=t={{.Timestamp.Unix}},v0={{.Signatures | join ","}}
-# DESTINATION_WEBHOOK_SIGNATURE_ENCODING="hex"
-# DESTINATION_WEBHOOK_SIGNATURE_ALGORITHM="hmac-sha256"
+# DESTINATIONS_WEBHOOK_HEADER_PREFIX="x-outpost-"
+# DESTINATIONS_WEBHOOK_DISABLE_DEFAULT_EVENT_ID_HEADER=false
+# DESTINATIONS_WEBHOOK_DISABLE_DEFAULT_SIGNATURE_HEADER=false
+# DESTINATIONS_WEBHOOK_DISABLE_DEFAULT_TIMESTAMP_HEADER=false
+# DESTINATIONS_WEBHOOK_DISABLE_DEFAULT_TOPIC_HEADER=false
+# DESTINATIONS_WEBHOOK_SIGNATURE_CONTENT_TEMPLATE={{.Timestamp.Unix}}.{{.Body}}
+# DESTINATIONS_WEBHOOK_SIGNATURE_HEADER_TEMPLATE=t={{.Timestamp.Unix}},v0={{.Signatures | join ","}}
+# DESTINATIONS_WEBHOOK_SIGNATURE_ENCODING="hex"
+# DESTINATIONS_WEBHOOK_SIGNATURE_ALGORITHM="hmac-sha256"
 
 # DISABLE_TELEMETRY=true
 

.outpost.yaml.example

@@ -85,6 +85,14 @@ destinations:
   metadata_path: "config/outpost/destinations" # Path to destination metadata
   webhook:
     header_prefix: "x-custom-" # Prefix for webhook headers
+    # disable_default_event_id_header
+    # disable_default_signature_header
+    # disable_default_timestamp_header
+    # disable_default_topic_header
+    # signature_content_template: {{.Timestamp.Unix}}.{{.Body}}
+    # signature_header_template: t={{.Timestamp.Unix}},v0={{.Signatures | join ","}}
+    # signature_encoding: hex
+    # signature_algorithm: hmac-sha256
 
 # Note: OpenTelemetry Configuration
 # It is recommended to configure OpenTelemetry using environment variables as they are better supported by the SDK.