internal: fix continuous.sh
internal: fix continuous.sh

It should run integration tests, not just unit.

Change-Id: Ib96308174de4d0292cc78ab601732f2a4be40375
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/39051
Reviewed-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Chris Broadfoot <0c2851a4f8ab4aa5606e69c0757771dd13dbe686@google.com>

googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go