chg: [hedgedoc] update base image to ``1.7.0``.

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

hedgedoc/metadata.yml

@@ -1,4 +1,4 @@
-docker-image: docker.0k.io/hackmd:2.2.0  ## from: nabo.codimd.dev/hackmdio/hackmd:2.2.0
+docker-image: docker.0k.io/hedgedoc:1.7.0  ## from: quay.io/hedgedoc/hedgedoc:1.7.0-alpine
 data-resources:
   - /home/hackmd/app/public/uploads