doc(infra): added more visualiztion to DevFW/forgejo-pm#30

docs/technical-documentation/architecture/decisions/environment-hierarchy.md

@@ -47,3 +47,5 @@ environments
         ├── edp
         └── observability
 ```
+
+![alt text](environments.png)

docs/technical-documentation/architecture/decisions/environments.puml

@@ -0,0 +1,42 @@
+@startuml
+!includeurl https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Context.puml
+
+LAYOUT_WITH_LEGEND()
+
+Person(dev, "Developer")
+
+System_Boundary(env, "environments") {
+    
+    System_Boundary(kind, "provider:kind") {
+        System_Boundary(kind_np, "platformzone:non-prod (vm-1 / local)") {
+            System(edp_kind, "edp")
+            System(obs_kind, "observability")
+        }
+    }
+
+    System_Boundary(otc, "provider:otc") {
+        System_Boundary(otc_np, "platformzone:non-prod (tenant-1)") {
+            System(edp_otc_np, "central-forgejo-aka-edp")
+            System(forgejo_dev, "forgejo-dev")
+            System(obs_otc_np, "observability")
+        }
+
+        System_Boundary(otc_prod, "platformzone:prod (tenant-2)") {
+            System(edp_otc_p, "edp")
+            System(obs_otc_p, "observability")
+        }
+    }
+
+    System_Boundary(scaleway, "provider:scaleway") {
+        System_Boundary(scaleway_np, "platformzone:non-prod (account-1)") {
+            ' leer
+        }
+
+        System_Boundary(scaleway_p, "platformzone:prod (account-2)") {
+            System(edp_scaleway_p, "edp")
+            System(obs_scaleway_p, "observability")
+        }
+    }
+}
+
+@enduml