health checks, validation and variable fix.

Signed-off-by: Basil Bruhn <basil.bruhn@psi.ch>

.env.example

@@ -0,0 +1,28 @@
+# Required non-SAP inputs to docker-compose.yaml.
+# Schema only: empty values deliberately fail Compose validation.
+# Puppet/Hiera owns the deployed .env. Do not replace it with this file.
+# Supplier-managed SAP/BANF settings are not included here.
+# Quote literal values containing dollar signs with single quotes in .env.
+
+# Swiss eCargo
+ecargo_api_key=
+
+# HedgeDoc (application and database use the same database credentials)
+hedgedoc_user=
+hedgedoc_password=
+bind_user=
+bind_password=
+session_secret=
+
+# IT strategy dashboard
+IT_DASHBOARD_DB_USER=
+IT_DASHBOARD_DB_PW=
+IT_DASHBOARD_DB_ROOT_PW=
+JWT_SECRET=
+ADMIN_PW_HASH=
+
+# Panda Maintenance
+PANDA_MAINTENANCE_DB_PW=
+
+# Tomcat Wiki
+TOMCATWIKI_DB_SECRET=