sandbox: add env:flex configuration file
vm: true is going away and less stable.
Add an alternate configuration file that uses the new App Engine
NOTE: the new environment currently has vastly different network
configuration, so it's important it's hosted at a different URL for now.
The module name is changed to "sandbox-flex" to reflect this.
Reviewed-by: Brad Fitzpatrick <firstname.lastname@example.org>
diff --git a/sandbox/app-flex.yaml b/sandbox/app-flex.yaml
new file mode 100644
@@ -0,0 +1,7 @@
+ check_interval_sec: 20
+ restart_threshold: 10