Fixes #5827

Motivation

Shallow clone of repository (introduced in #5748) fetches the default branch only.

From Git - git-clone Documentation:

--depth <depth>
Create a shallow clone with a history truncated to the specified number of commits. Implies --single-branch unless --no-single-branch is given to fetch the histories near the tips of all branches.

This causes git checkout of the deployment branch to fail (with version 2.0.0-beta.8 of @docusaurus/core):

Cloning into '/tmp/my-docs-gh-pagesQ1g5AP'...
CMD: git clone --depth 1 ***github.com/my-org/my-docs.git /tmp/my-docs-gh-pagesQ1g5AP (code: 0)
main
error: pathspec 'origin/gh-pages' did not match any file(s) known to git
CMD: git checkout origin/gh-pages (code: 1)
CMD: git checkout --orphan gh-pages (code: 0)

As a result of this, the command will go on to attempt to force push the orphan branch, and thereby overwrite any existing commits on the deployment branch (unless there is a branch protection rule preventing force pushes, in which case the deployment will fail altogether).

Adding --no-single-branch to the command should solve this issue.

An alternative solution with --branch ${deploymentBranch} could probably also be used here.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Tested command locally.

Related PRs

#5748