Pin dockerfile dependencies. (#668)
diff --git a/.ci/Dockerfile b/.ci/Dockerfile
index f3bb4d3..3f653bd 100644
--- a/.ci/Dockerfile
+++ b/.ci/Dockerfile
@@ -1,8 +1,8 @@
-# Last updated 12/14/2021 (to rebuild the docker image, update this timestamp)
+# Last updated 02/04/2022 (to rebuild the docker image, update this timestamp)
# The Flutter version is not important here, since the CI scripts update Flutter
# before running. What matters is that the base image is pinned to minimize
# unintended changes when modifying this file.
-FROM cirrusci/flutter:2.8.0
+FROM cirrusci/flutter@sha256:02607513bf0b3daf303ab54c495efc4dd5cabf889a201be75c88b1e9888e0f5d
RUN sudo apt-get update && \
sudo apt-get upgrade --yes && \
diff --git a/.cirrus.yml b/.cirrus.yml
index f77c9f7..fdf306e 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -35,7 +35,7 @@
task:
gke_container:
dockerfile: .ci/Dockerfile
- builder_image_name: docker-builder # gce vm image
+ builder_image_name: docker-builder-linux # gce vm image
builder_image_project: flutter-cirrus
cluster_name: test-cluster
zone: us-central1-a
