Raw refactoring of roles

roles/docker-attendize/meta/schema.yml

@@ -0,0 +1,5 @@
+credentials:
+  database_password:
+    description: "Database password for MariaDB used by Attendize"
+    algorithm: "bcrypt"
+    validation: "^\\$2[aby]\\$.{56}$"

roles/docker-attendize/vars/configuration.yml

@@ -0,0 +1,9 @@
+version:                      "latest"
+credentials:
+# database_password: Password for the database
+
+features:
+  matomo:             true
+  css:                true
+  landingpage_iframe: false
+  central_database:   true

roles/docker-attendize/vars/main.yml

@@ -1,5 +1,5 @@
 ---
 application_id:             "attendize"
 database_type:              "mariadb"
-database_password:          "{{attendize_database_password}}"
+database_password:          "{{applications[application_id].credentials.database_password}}"
 docker_repository_address:  "https://github.com/Attendize/Attendize.git"