Don't enforce that checkout path must be inside of Github Workspace

Fixes actions#327, Fixes actions#197.
And i also hit this.

Author: LebedevRI

README.md

@@ -82,7 +82,7 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
     # Default: true
     persist-credentials: ''
 
-    # Relative path under $GITHUB_WORKSPACE to place the repository
+    # Path relative to $GITHUB_WORKSPACE to place the repository
     path: ''
 
     # Whether to execute `git clean -ffdx && git reset --hard HEAD` before fetching

action.yml

@@ -49,7 +49,7 @@ inputs:
     description: 'Whether to configure the token or SSH key with the local git config'
     default: true
   path:
-    description: 'Relative path under $GITHUB_WORKSPACE to place the repository'
+    description: 'Path relative to $GITHUB_WORKSPACE to place the repository'
   clean:
     description: 'Whether to execute `git clean -ffdx && git reset --hard HEAD` before fetching'
     default: true

src/input-helper.ts

@@ -40,15 +40,6 @@ export function getInputs(): IGitSourceSettings {
     githubWorkspacePath,
     result.repositoryPath
   )
-  if (
-    !(result.repositoryPath + path.sep).startsWith(
-      githubWorkspacePath + path.sep
-    )
-  ) {
-    throw new Error(
-      `Repository path '${result.repositoryPath}' is not under '${githubWorkspacePath}'`
-    )
-  }
 
   // Workflow repository?
   const isWorkflowRepository =