chore(deps): bump docker/metadata-action from 3.7.0 to 3.8.0 (#15)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 3.7.0 to 3.8.0.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](https://github.com/docker/metadata-action/compare/v3.7.0...v3.8.0)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
         uses: actions/checkout@v3
       - name: Prepare
         id: prep
-        uses: docker/metadata-action@v3.7.0
+        uses: docker/metadata-action@v3.8.0
         with:
           images: |
             ${{ github.repository_owner }}/ftp-server