Merge pull request #13927 from sennyeya/NewCliOptionsPublicPathAndBackendUrl

Update AppManager to Allow for Multiple Stages with a Single Build

.changeset/five-trainers-admire.md

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+---
+'@backstage/cli': patch
+---
+
+Fix webpack dev server issue where it wasn't serving `index.html` from correct endpoint on subsequent requests.

.changeset/young-chairs-check.md

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+---
+'@backstage/core-app-api': patch
+---
+
+Apps will now rewrite the `app.baseUrl` configuration to match the current `location.origin`. The `backend.baseUrl` will also be rewritten in the same way when the `app.baseUrl` and `backend.baseUrl` have matching origins. This will reduce the need for separate frontend builds for different environments.