Could not determine ref type of version: fatal: could not read Username for 'https://<ENTERPRISE_URL>/': No such device or address

is the address valid? It uses the GitHub server URL from the GITHUB_SERVER_URL (see the default environment variables here) here:

Now that I'm looking at the code, though, it's probably because the code that sets up authentication using the provided token uses github.com:

1. In the setup:

   action-ros-ci/src/action-ros-ci.ts

   Lines 523 to 572 in 8bcafc2

   	// Unset all local extraheader config entries possibly set by actions/checkout,
   	// because local settings take precedence and the default token used by
   	// actions/checkout might not have the right permissions for any/all repos
   	await execShellCommand(
   	[
   	`/usr/bin/git config --local --unset-all http.https://github.com/.extraheader || true`,
   	],
   	options,
   	);
   	await execShellCommand(
   	[
   	String.raw`/usr/bin/git submodule foreach --recursive git config --local --name-only --get-regexp 'http\.https\:\/\/github\.com\/\.extraheader'` +
   	` && git config --local --unset-all 'http.https://github.com/.extraheader' || true`,
   	],
   	options,
   	);
   	// Use a global insteadof entry because local configs aren't observed by git clone
   	await execShellCommand(
   	[
   	`/usr/bin/git config --global url.https://x-access-token:${importToken}@github.com.insteadof 'https://github.com'`,
   	],
   	options,
   	);
   	// same as last three comands but for ssh urls
   	await execShellCommand(
   	[
   	`/usr/bin/git config --local --unset-all git@github.com:.extraheader || true`,
   	],
   	options,
   	);
   	await execShellCommand(
   	[
   	String.raw`/usr/bin/git submodule foreach --recursive git config --local --name-only --get-regexp 'git@github\.com:.extraheader'` +
   	` && git config --local --unset-all 'git@github.com:.extraheader' || true`,
   	],
   	options,
   	);
   	// Use a global insteadof entry because local configs aren't observed by git clone (ssh)
   	await execShellCommand(
   	[
   	`/usr/bin/git config --global url.https://x-access-token:${importToken}@github.com/.insteadof 'git@github.com:'`,
   	],
   	options,
   	);
   	if (core.isDebug()) {
   	await execShellCommand(
   	[`/usr/bin/git config --list --show-origin || true`],
   	options,
   	);
   	}

2. In the cleanup:

   action-ros-ci/src/action-ros-ci.ts

   Lines 786 to 792 in 8bcafc2

   	// Unset config so that it doesn't leak to other actions
   	await execShellCommand(
   	[
   	`/usr/bin/git config --global --unset-all url.https://x-access-token:${importToken}@github.com.insteadof`,
   	],
   	options,
   	);

It should use the URL from the GITHUB_SERVER_URL environment variable, which would need to be stripped of https:// in some cases. I've quickly implemented it, see #926. Please give it a try using action-ros-ci@christophebedard/token-auth-use-github-server-url-env-var. I assume you can easily mirror the branch into your enterprise server.

This does mean you couldn't access private repos on github.com from an enterprise server using a token from github.com saved in the enterprise server, but I don't know if that's a common use-case.

Thank you @christophebedard! The branch solved the issue. I agree that private repos from github.com while on GitHub Enterprise seems unlikely, though perhaps one day someone will make an issue for this. I imagine this would require a fair amount of restructuring to work.