Use 3.12 instead of 3.8 for system tests

Author: gkevinzheng

bigtable_delete.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+function filter_instances() {
+    gcloud bigtable instances list | grep -v "NAME" | awk '{print $1}' | grep $1
+}
+
+# function filter_backups() {
+    
+# }
+
+function delete_instances() {
+    for instance in $(filter_instances $1); do
+    # if [ -z "$2" ]; then
+    #     for backup in $()
+    # fi
+        gcloud bigtable instances delete $instance
+    done
+}
+
+current_project=$(gcloud config get project)
+
+gcloud config set project precise-truck-742
+delete_instances g-c-p-*
+delete_instances python-bigtable-tests-*
+delete_instances admin-overlay-instance-*
+gcloud config set project $current_project

test.out

@@ -0,0 +1,5 @@
+nox > Running session system-3.8
+nox > Creating virtual environment (virtualenv) using python3.8 in .nox/system-3-8
+nox > python -m pip install --pre 'grpcio!=1.52.0rc1'
+nox > Interrupted...
+nox > Session system-3.8 interrupted.