internal/config: disable BigQuery by default

If the bigquery dataset is not set, don't try and connect to BigQuery.

Change-Id: I72b3ecb7d95fb061ea55f49ebe812dc5006d33c2
Reviewed-on: https://go-review.googlesource.com/c/pkgsite-metrics/+/465218
Reviewed-by: Julie Qiu <julieqiu@google.com>
Run-TryBot: Julie Qiu <julieqiu@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Auto-Submit: Julie Qiu <julieqiu@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
diff --git a/internal/config/config.go b/internal/config/config.go
index 974fe67..63aad15 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -117,7 +117,7 @@
 		VersionID:             os.Getenv("DOCKER_IMAGE"),
 		LocationID:            "us-central1",
 		StaticPath:            ts,
-		BigQueryDataset:       GetEnv("GO_ECOSYSTEM_BIGQUERY_DATASET", "test"),
+		BigQueryDataset:       GetEnv("GO_ECOSYSTEM_BIGQUERY_DATASET", "disable"),
 		QueueName:             os.Getenv("GO_ECOSYSTEM_QUEUE_NAME"),
 		QueueURL:              os.Getenv("GO_ECOSYSTEM_QUEUE_URL"),
 		VulnDBBucketProjectID: os.Getenv("GO_ECOSYSTEM_VULNDB_BUCKET_PROJECT"),