deploy: add go env

Change-Id: Id8f076d7ad1751cc6266bee4567366cdcf062e5d
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/551875
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
diff --git a/deploy/build.yaml b/deploy/build.yaml
index 5531c65..99bce90 100644
--- a/deploy/build.yaml
+++ b/deploy/build.yaml
@@ -68,6 +68,6 @@
   - id: PostValidate
     name: golang:1.12.5
     entrypoint: bash
-    args: ["-ec", "go run ./cmd/checkdb -v1 -legacy /workspace/deployed/go-vulndb"]
+    args: ["-ec", "go env && go run ./cmd/checkdb -v1 -legacy /workspace/deployed/go-vulndb"]
     env:
       - 'GOPROXY=https://proxy.golang.org'