Config-file step to generate `$version`, but not actually update files

[BatmanAoD]

I would like to have a way to get the "next version" that will be generated from the current commit history. Right now, the best approach I can think of is to actually prepare a release, then undo the changes:

[[workflows.steps]]
type = "Command"
shell = true
command = """
    if ! git diff --staged --exit-code . >/dev/null; then
        echo "Error: cannot run get-next-version when there are changes in the repo. Please commit or stash."
        exit 1
    fi
"""

[[workflows.steps]]
type = "PrepareRelease"

[[workflows.steps]]
type = "Command"
command = 'echo "$version"'

[[workflows.steps]]
type = "Command"
command = """
    git restore --source=HEAD .
"""

This seems pretty brittle, though.