fix: add validation to mount-path

[kanoru3101]

What/Why/How?

mount-path was not checked, which led to errors when used with an empty path or a path identical (/) to the project path.

Reference

Testing

Error when using --mount-path or --mp with an empty path or root path.

Mount path cannot be empty or root path. Please use --mount-path option with a valid path.

Screenshots (optional)

Example of usage

Check yourself

• Code changed? - Tested with Redoc/Realm/Reunite (internal)
• All new/updated code is covered by tests
• New package installed? - Tested in different environments (browser/node)
• Documentation update considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

🦋 Changeset detected

Latest commit: 512a7ce

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@redocly/cli	Patch
@redocly/openapi-core	Patch
@redocly/respect-core	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[changeset-bot]

⚠️ No Changeset found

Latest commit: ab72f01

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	1.367 ± 0.007	1.357	1.378	1.01 ± 0.02
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1.358 ± 0.021	1.341	1.413	1.00

[github-actions]

📦 A new experimental 🧪 version v0.0.0-snapshot.1761649655 of Redocly CLI has been published for testing.

Install with NPM:

npm install @redocly/cli@0.0.0-snapshot.1761649655
# or
npm install @redocly/openapi-core@0.0.0-snapshot.1761649655
# or
npm install @redocly/respect-core@0.0.0-snapshot.1761649655

⚠️ Note: This is a development build and may contain unstable features.

[github-actions]

📦 A new experimental 🧪 version v0.0.0-snapshot.1761650882 of Redocly CLI has been published for testing.

Install with NPM:

npm install @redocly/cli@0.0.0-snapshot.1761650882
# or
npm install @redocly/openapi-core@0.0.0-snapshot.1761650882
# or
npm install @redocly/respect-core@0.0.0-snapshot.1761650882

⚠️ Note: This is a development build and may contain unstable features.

[tatomyr]

Have you considered updating the corresponding documentation?

[kanoru3101]

Have you considered updating the corresponding documentation?

Updated information about the path in the push command for mount-path.