.github: add Blunderbuss config

This will make it so issues with the corresponding label will automatically
be assigned to a random user listed for that label.

Change-Id: Ica2d3a95dbdd25cfa1cb465edc6bdbdc17ca631c
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/57190
Reviewed-by: Seth Hollyman <shollyman@google.com>
Reviewed-by: Chris Cotter <cjcotter@google.com>
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Cody Oss <codyoss@google.com>
Reviewed-by: Shanika Kuruppu <skuruppu@google.com>
Reviewed-by: Alex Hong <hongalex@google.com>
diff --git a/.github/blunderbuss.yml b/.github/blunderbuss.yml
new file mode 100644
index 0000000..dbc6f2b
--- /dev/null
+++ b/.github/blunderbuss.yml
@@ -0,0 +1,20 @@
+assign_issues_by:
+- labels:
+  - 'api: bigtable'
+  - 'api: datastore'
+  - 'api: firestore'
+  - 'api: storage'
+  to:
+  - tritone
+- labels:
+  - 'api: bigquery'
+  to:
+  - shollyman
+- labels:
+  - 'api: pubsub'
+  to:
+  - hongalex
+- labels:
+  - 'api: spanner'
+  to:
+  - skuruppu
\ No newline at end of file