* add `onFound` callback to schemas

* add warning to method docs (for #4957)

* implement Docker OAuth2 init block support

* update docs

* add OAUTH_SCOPE_SEPARATOR

* drop OAuth env from Dockerfile and run script

* don't indent the first oauth block line

* drop unused `dedent` import

* touch up warning message

* add more test cases

* return an empty block if no OAuth content is generated

* fix broken doc line

* allow legacy values to override base values