Huge role refactoring/cleanup. Other commits will propably follow. Because some bugs will exist. Still important for longrun and also for auto docs/help/slideshow generation

roles/web-app-keycloak/templates/env.j2

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+# Environment File for Keycloak 
+# Documentation can be found here: 
+# @see https://www.keycloak.org/server/containers
+
+KC_HOSTNAME=                    https://{{domains | get_domain(application_id)}}
+KC_HTTP_ENABLED=                true
+
+# Health Checks
+# @see https://quarkus.io/guides/smallrye-health
+KC_HEALTH_ENABLED=              true
+KC_METRICS_ENABLED=             true
+
+# Administrator
+KEYCLOAK_ADMIN=                 "{{applications[application_id].users.administrator.username}}"
+KEYCLOAK_ADMIN_PASSWORD=        "{{applications[application_id].credentials.administrator_password}}"
+
+# Database
+KC_DB=                          postgres
+KC_DB_URL=                      {{database_url_jdbc}}
+KC_DB_USERNAME=                 {{database_username}}
+KC_DB_PASSWORD=                 {{database_password}}
+
+# If the initial administrator already exists and the environment variables are still present at startup, an error message stating the failed creation of the initial administrator is shown in the logs. Keycloak ignores the values and starts up correctly.
+KC_BOOTSTRAP_ADMIN_USERNAME=    "{{applications[application_id].users.administrator.username}}"
+KC_BOOTSTRAP_ADMIN_PASSWORD=    "{{applications[application_id].credentials.administrator_password}}"