v0.21 Add support for Gossamer inlined external image URLs in Discourse

gossamer_forums.rb

@@ -1,5 +1,5 @@
 # gossamer threads migration-import code
-# v0.20
+# v0.21
 
 require 'mysql2'
 require 'open-uri'
@@ -687,6 +687,9 @@ class GossamerForumsImporter < ImportScripts::Base
     # Remove unsupported tags
     sanitized_message.gsub!(/\[.*?\]/, '')
 
+    # Convert inline image syntax from `!(url)` to `![image](url)`
+    sanitized_message.gsub!(/!\((http[s]?:\/\/[^\)]+)\)/, '![image](\1)')
+
     sanitized_message
   end