Merge pull request #67048 from rail/2go_version-21.1

build: use go1.15 for acceptance test

build/teamcity-acceptance.sh

@@ -41,7 +41,15 @@ tc_start_block "Run acceptance tests"
 #
 # Note that ./pkg/acceptance without the tag is an empty test package, so it's fine to compile
 # outside of builder.
-run_json_test env TZ=America/New_York stdbuf -eL -oL go test \
+go=go
+# Use older version of Go on the agent in case it's installed. See
+# https://github.com/cockroachdb/cockroach/issues/66977 for the details.
+if [ -x /usr/local/go1.15/bin/go ]; then
+  go=/usr/local/go1.15/bin/go
+  echo "WARN: using previous version of Go from $go"
+fi
+
+run_json_test env TZ=America/New_York stdbuf -eL -oL $go test \
   -mod=vendor -json -timeout 30m -v \
 	-exec "../../build/teamcity-go-test-precompiled.sh ./pkg/acceptance/acceptance.test" ./pkg/acceptance \
 	-l "$TMPDIR"