Roger.
Liquibase is running inside the Docker container, which is a Linux instance.So, Liquibase looks at the changelog.xml and sees it needs to run some SQL in a directory. Then, it looks for the SQL in that Windows directory and can't find anything. After all, "C:\..." doesn't mean much in Linux land.
I would suggest using a relative path in your path attribute and putting the directory in the same place as the changelog.xml.
Let me know if that works for you.
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Thanks!
Robert