Add dependabot for docker files. (#97556)

.github/dependabot.yml

@@ -15,3 +15,15 @@ updates:
       - "team"
       - "team: infra"
       - "waiting for tree to go green"
+  - package-ecosystem: "docker"
+    directory: "/dev/ci/docker_linux"
+    schedule:
+      interval: "weekly"
+    reviewers:
+      - "keyonghan"
+      - "yusufm"
+      - "fujino"
+    labels:
+      - "team"
+      - "team: infra"
+      - "waiting for tree to go green"

dev/ci/docker_linux/Dockerfile

@@ -98,33 +98,11 @@ RUN touch ~/.android/repositories.cfg
 
 # Add npm to path.
 ENV PATH="/usr/bin:${PATH}"
-RUN dpkg-query -L nodejs
-# Install Firebase
-# This is why we need nodejs installed.
-RUN /usr/bin/npm --verbose install -g firebase-tools@10.1.2
-
-# Install golang more recent than in repo (necessary for dashing to build)
-RUN curl 'https://dl.google.com/go/go1.13.3.linux-amd64.tar.gz' | tar xvz
-ENV GOBINARY=/go/bin/go
-
-# Install dashing
-RUN mkdir -p /opt/gopath/bin
-ENV GOPATH=/opt/gopath
-ENV PATH="${GOPATH}/bin:${PATH}"
-RUN $GOBINARY get -u github.com/technosophos/dashing
 
 # Set locale to en_US
 RUN locale-gen en_US "en_US.UTF-8" && DEBIAN_FRONTEND=noninteractive dpkg-reconfigure locales
 ENV LANG en_US.UTF-8
 
-# Install fastlane via pinned Gemfile & Gemfile.lock
-# Skip all the documentation (-N) since it's just on CI.
-RUN gem install bundler -N
-
-# Gemfile last edited 1/6/2019 (update to trigger a rebuild of Docker image)
-COPY ci/docker_linux/Gemfile /Gemfile
-COPY ci/docker_linux/Gemfile.lock /Gemfile.lock
-
 # Install dependencies for desktop flutter run
 RUN apt-get install -y --no-install-recommends \
   clang \
@@ -137,6 +115,3 @@ RUN apt-get install -y --no-install-recommends \
 	xvfb && \
   apt-get upgrade -y --no-install-recommends && \
   apt-get clean
-
-RUN bundle config set system 'true' && \
-  bundle install --system

dev/ci/docker_linux/README.md

@@ -4,12 +4,3 @@ building flutter/flutter in our CI system (currently [Cirrus](cirrus-ci.org)).
 To run the scripts, you have to set up `docker` and `gcloud`. Please
 refer to the [internal flutter team doc](go/flutter-team) for how to set up in a
 Google internal environment.
-
-To debug the image locally:
-* (Optional) edit the `Dockerfile` to change how the container image is built.
-* Run `./docker_build.sh` to build the container image (`sudo` permission is
-  required)
-* Run `./docker_attach.sh` to start a container from the image and attach to its
-  internal bash shell. From here, you can invoke shell commands from the
-  `.cirrus.yml` (you will have to manually run any `setup` steps; e.g. the
-  container will not have the Flutter repo cloned yet).

dev/ci/docker_linux/docker_attach.sh

@@ -1,12 +0,0 @@
-#!/usr/bin/env bash
-# Copyright 2014 The Flutter Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-TAG="${CIRRUS_TAG:-latest}"
-
-# Starts an interactive docker container with a bash shell running in it, and
-# attaches the user's shell to it.
-sudo docker run --interactive --tty \
-  "gcr.io/flutter-cirrus/build-flutter-image:$TAG" \
-  /bin/bash

dev/ci/docker_linux/docker_build.sh

@@ -1,24 +0,0 @@
-#!/usr/bin/env bash
-# Copyright 2014 The Flutter Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# Capture the directory this script resides in
-SCRIPT_DIRECTORY="$(dirname $(readlink -f "$0"))"
-
-# Set context to flutter/dev
-CONTEXT="${SCRIPT_DIRECTORY}/../.."
-
-TAG="${CIRRUS_TAG:-latest}"
-
-# Convert "+" to "-" to make hotfix tags legal Docker tag names.
-# See https://docs.docker.com/engine/reference/commandline/tag/
-TAG=${TAG/+/-}
-
-# pull to make sure we are not rebuilding for nothing
-sudo docker pull "gcr.io/flutter-cirrus/build-flutter-image:$TAG"
-
-sudo docker build "$@" \
-  --tag "gcr.io/flutter-cirrus/build-flutter-image:$TAG" \
-  --file "$SCRIPT_DIRECTORY/Dockerfile" \
-  "$CONTEXT"

dev/ci/docker_linux/docker_login.sh

@@ -1,10 +0,0 @@
-#!/usr/bin/env bash
-# Copyright 2014 The Flutter Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-if [[ -n "$CIRRUS_CI" && -n "$GCLOUD_CREDENTIALS" ]]; then
-  echo "$GCLOUD_CREDENTIALS" | base64 --decode | docker login -u _json_key --password-stdin https://gcr.io
-else
-  gcloud auth print-access-token | sudo docker login -u oauth2accesstoken --password-stdin https://gcr.io
-fi

dev/ci/docker_linux/docker_push.sh

@@ -1,12 +0,0 @@
-#!/usr/bin/env bash
-# Copyright 2014 The Flutter Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-TAG="${CIRRUS_TAG:-latest}"
-
-# Convert "+" to "-" to make hotfix tags legal Docker tag names.
-# See https://docs.docker.com/engine/reference/commandline/tag/
-TAG=${TAG/+/-}
-
-sudo docker push "gcr.io/flutter-cirrus/build-flutter-image:$TAG"