feat(repo): add repo clean command to remove untracked files

This introduces the `pkgctl repo clean` command which removes every
untracked files from local package repositories (via `git clean`).

The usage is as simple as `pkgctl repo clean [OPTION] [PATH]` (where
"[PATH]" can be equal to a wildcard "*").

Component: pkgctl repo clean

1 files changed, 40 insertions, 0 deletions

diff --git a/doc/man/pkgctl-repo-clean.1.asciidoc b/doc/man/pkgctl-repo-clean.1.asciidoc
new file mode 100644
index 0000000..b39693c
--- /dev/null
+++ b/doc/man/pkgctl-repo-clean.1.asciidoc
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+pkgctl-repo-clean(1)
+====================
+
+Name
+----
+
+pkgctl-repo-clean - Remove untracked files from the working tree
+
+Synopsis
+--------
+
+pkgctl repo clean [OPTION] [PATH]...
+
+Description
+-----------
+
+Cleans the working tree by recursively removing files that are not under
+version control, starting from the current directory.
+
+Files unknown to Git as well as ignored files are removed. This can, for
+example, be useful to remove all build products.
+
+Options
+-------
+
+*-i, --interactive*::
+	Show what would be done and clean files interactively
+
+*-n, --dry-run*::
+	Don't actually remove anything, just show what would be done
+
+*-h, --help*::
+	Show a help text
+
+See Also
+--------
+
+git-clean(1)
+
+include::include/footer.asciidoc[]