Addon-docs: Fix BuilderConfig can be an object

[tmeasday]

In #16219, the builder key in main.js is allowed to be an object (with key name). However, some other code assumes it is a string.

ERR! TypeError: builder.match is not a function
ERR!     at _callee$ (/Users/tom/GitHub/chromatic/node_modules/@storybook/addon-docs/dist/cjs/frameworks/common/preset.js:133:30)
ERR!     at tryCatch (/Users/tom/GitHub/chromatic/node_modules/regenerator-runtime/runtime.js:63:40)
ERR!     at Generator.invoke [as _invoke] (/Users/tom/GitHub/chromatic/node_modules/regenerator-runtime/runtime.js:294:22)
ERR!     at Generator.next (/Users/tom/GitHub/chromatic/node_modules/regenerator-runtime/runtime.js:119:21)
ERR!     at asyncGeneratorStep (/Users/tom/GitHub/chromatic/node_modules/@storybook/addon-docs/dist/cjs/frameworks/common/preset.js:56:103)
ERR!     at _next (/Users/tom/GitHub/chromatic/node_modules/@storybook/addon-docs/dist/cjs/frameworks/common/preset.js:58:194)

What I did

Fixed, actually used types properly.

How to test

Create an app that uses the FS cache. Should we do that in an example @shilman?

[nx-cloud]

☁️ Nx Cloud Report

CI ran the following commands for commit 033ace8. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this branch

---

✅ Successfully ran 1 target

• nx run-many --target=prepare --all --parallel --max-parallel=15

---

Sent with 💌 from NxCloud.

[shilman]

LGTM! 💯