Merge pull request #3007 from freifunk-gluon/dependabot/github_actions/docker/metadata-action-879dcbb708d40f8b8679d4f7941b938a086e23a7

build(deps): bump docker/metadata-action from 9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7 to 879dcbb708d40f8b8679d4f7941b938a086e23a7