Add deployment configuration hint to docs (#106)

Author: markus-moser

doc/01_Installation/README.md

@@ -44,9 +44,23 @@ See [OpenSearch Client Setup](../02_Configuration/04_Opensearch.md) for more inf
 ./bin/console messenger:consume pimcore_generic_data_index_queue
 ```
 
+**Deployment hint:** 
+
+For deployments of applications with this bundle via deployment pipelines without actual database access, the Symfony cache warming process could fail as doctrine ORM tries to determine the database version on cache warm-up to build its cache. Therefore, it is recommended to configure the database server version in the default DBAL connection like this:
+
+```yaml
+doctrine:
+    dbal:
+        default_connection: default
+        connections:
+            default:
+                ...
+                server_version: mariadb-10.11.0
+```
+
 ## Commands after Installation
 
 It is needed to run following command after installation (at least) once to create the indices and add all assets and data objects to the index queue:
 ```bash
 ./bin/console generic-data-index:update:index -r
-```
+```