new: [bitwarden] declare relations.

bitwarden/metadata.yml

@@ -3,3 +3,13 @@ description: Bitwarden Server
 docker-image: docker.0k.io/bitwarden
 data-resources:
   - /data
+uses:
+  web-proxy:
+    constraint: recommended
+    auto: pair
+    solves:
+      proxy: "Public access"
+    default-options:
+      ## We need to specify here the port as it can't be infered
+      ## easily as there are 2 ports exposed by the image.
+      target: !var-expand ${MASTER_BASE_SERVICE_NAME}:80