fix: allow custom redocly file using --redocly

[mynnx]

Changes

Resolves #2190 in which the CLI hangs when specifying a different path for redocly.yaml using the --redocly CLI flag. We've got several redocly.yaml files so this fix is necessary for us.

The old code only called findConfig on the dirname() of the argument you passed, looking for a redocly.yaml in that directory - so it wasn't looking for the file path you specified on the command line. In addition, when it couldn't find a path, it silently fell back to a minimal config waiting on input with a valid config.

Now it looks for either

• a redocly.yaml file in the directory you've specified (old behavior), or
• the specific file you're pointing at

and has clear error messages when it can't be found.

How to Review

Run the new test, or:

Happy path

 node packages/openapi-typescript/bin/cli.js \
  --redocly packages/openapi-typescript/test/fixtures/redocly-flag/redocly.alt.yaml
 ⚠  Component: "Problem" is never used. at #/components/schemas/Problem
🚀 b@v1 → ./output-alt/b.ts [53.7ms]
 ⚠  Component: "Problem" is never used. at #/components/schemas/Problem
🚀 a@v1 → ./output-alt/a.ts [64.2ms]
 ⚠  Component: "Problem" is never used. at #/components/schemas/Problem
🚀 c@v1 → ./output-alt/c.ts [74.9ms]

Failure path

 node packages/openapi-typescript/bin/cli.js \
  --redocly packages/openapi-typescript/test/fixtures/redocly-flag/NOT_A_REAL_FILE.yaml 
 ✘  Redocly config not found at: packages/openapi-typescript/test/fixtures/redocly-flag/redocly.alt.yam
file:///Users/mark.everett/Development/tmp/openapi-typescript/packages/openapi-typescript/bin/cli.js:161
  throw new Error(message);
        ^

Error: Redocly config not found at: packages/openapi-typescript/test/fixtures/redocly-flag/redocly.alt.yam
    at errorAndExit (file:///Users/mark.everett/Development/tmp/openapi-typescript/packages/openapi-typescript/bin/cli.js:161:9)
    ...

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• [] pnpm run update:examples run (only applicable for openapi-typescript)
  • ☝️  ERR_PNPM_NO_SCRIPT  Missing script: update:examples

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