talks: set CHECK_COUNTRY env var in app.yaml

This uses the new golangorgenv package from CL 165459 to enable
country check in the /share endpoint registered by x/tools/playground
package. This improves consistency with other similar services that
also use the x/tools/playground package.

Updates golang/go#30486

Change-Id: Idc6db4e384a7392aa39967f3320c2158a9c7e99a
Reviewed-by: Brad Fitzpatrick <>
1 file changed