terraform: increase worker memory

The worker was crashing when cloning the cvelist repo.

Change-Id: Ie2c85d2f6c02120dc9f1a271b49fb4d4263e5624
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/371600
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>
diff --git a/terraform/environment/worker.tf b/terraform/environment/worker.tf
index e550c64..f18bc32 100644
--- a/terraform/environment/worker.tf
+++ b/terraform/environment/worker.tf
@@ -90,7 +90,7 @@
         resources {
           limits = {
             "cpu"    = "1000m"
-            "memory" = "1Gi"
+            "memory" = "2Gi"
           }
         }
       }