new: [keycloak] add relation with postgres

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

keycloak/hooks/postgres_database-relation-joined

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+set -e
+
+PASSWORD="$(relation-get password)"
+USER="$(relation-get user)"
+DBNAME="$(relation-get dbname)"
+
+config-add "\
+services:
+  $MASTER_BASE_SERVICE_NAME:
+    environment:
+      DB_VENDOR: postgres
+      DB_ADDR: \"$MASTER_TARGET_SERVICE_NAME\"
+      DB_DATABASE: \"$DBNAME\"
+      DB_PASSWORD: \"$PASSWORD\"
+      DB_USER: \"$USER\"
+"

keycloak/metadata.yml

@@ -12,3 +12,11 @@ uses:
       proxy: "Public access"
     default-options:
       target: !var-expand ${MASTER_BASE_SERVICE_NAME}:8080
+  postgres-database:
+    #constraint: required | recommended | optional
+    #auto: pair | summon | none ## default: pair
+    constraint: required
+    auto: summon
+    solves:
+      database: "main storage"
+    default-options: