feat: add platformsh config

.platform/routes.yaml

@@ -0,0 +1,7 @@
+"https://{default}/":
+    type: upstream
+    upstream: "app:http"
+
+"https://www.{default}/":
+    type: redirect
+    to: "https://{default}/"

.platform/services.yaml

@@ -0,0 +1,10 @@
+# The name given to the PostgreSQL service (lowercase alphanumeric only).
+dbpostgres:
+    # The type of your service (postgresql), which uses the format
+    # 'type:version'. Be sure to consult the PostgreSQL documentation
+    # (https://docs.platform.sh/add-services/postgresql.html#supported-versions)
+    # when choosing a version. If you specify a version number which is not available,
+    # the CLI will return an error.
+    type: postgresql:15
+    # The disk attribute is the size of the persistent disk (in MB) allocated to the service.
+    disk: 2048