Bump docker/metadata-action from 5.7.0 to 5.8.0

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 5.7.0 to 5.8.0.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@902fa8e...c1e5197)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-version: 5.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -28,7 +28,7 @@ jobs:
       -
         name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804
+        uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f
         with:
           images: liberu/boilerplate