如何在Google Cloud Platform上加快bazel构建

我正在使用gcr.io/cloud-builders/bazelGoogle容器构建构建图像。

从日志中看，似乎花费了大部分时间来设置bazel工作区。这个工作空间在构建之间并没有变化，因此我认为可以预先计算并存储在新映像中。

如何加快在Google Cloud Platform上构建这些bazel的速度？

Already have image (with digest): gcr.io/cloud-builders/bazel
Extracting Bazel installation...
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WARNING: /builder/home/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_bazel_rules_go/go/def.bzl:137:3: DEPRECATED: com_github_golang_protobuf : new_go_repository is deprecated. Please migrate to go_repository soon.
WARNING: /builder/home/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_bazel_rules_go/go/def.bzl:137:3: DEPRECATED: com_github_golang_glog : new_go_repository is deprecated. Please migrate to go_repository soon.
WARNING: /builder/home/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_bazel_rules_go/go/def.bzl:137:3: DEPRECATED: org_golang_google_grpc : new_go_repository is deprecated. Please migrate to go_repository soon.
WARNING: /builder/home/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_bazel_rules_go/go/def.bzl:137:3: DEPRECATED: org_golang_x_net : new_go_repository is deprecated. Please migrate to go_repository soon.
WARNING: /builder/home/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_bazel_rules_go/go/def.bzl:137:3: DEPRECATED: com_github_gogo_protobuf : new_go_repository is deprecated. Please migrate to go_repository soon.
WARNING: /builder/home/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_bazel_rules_go/go/def.bzl:137:3: DEPRECATED: com_github_grpc_ecosystem_grpc_gateway : new_go_repository is deprecated. Please migrate to go_repository soon.
WARNING: /builder/home/.cache/bazel/_bazel_root/eab0d61a99b6696edb3d2aff87b585e8/external/io_bazel_rules_go/go/def.bzl:137:3: DEPRECATED: org_golang_google_genproto : new_go_repository is deprecated. Please migrate to go_repository soon.
Analyzing: target //:docker (4 packages loaded)
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Analyzing: target //:docker (79 packages loaded)
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Analyzing: target //:docker (160 packages loaded)
Analyzing: target //:docker (160 packages loaded)
Analyzing: target //:docker (160 packages loaded)
Analyzing: target //:docker (160 packages loaded)
Analyzing: target //:docker (174 packages loaded)
Analyzing: target //:docker (174 packages loaded)
Analyzing: target //:docker (211 packages loaded)
INFO: Analysed target //:docker (286 packages loaded).
INFO: Found 1 target...
[0 / 1] BazelWorkspaceStatusAction stable-status.txt
[17 / 19] SHA256 external/golang/image/002.tar.gz.nogz.sha256
[42 / 281] no action running
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[168 / 407] Compiling external/com_github_google_protobuf/src/google/protobuf/compiler/csharp/csharp_message_field.cc [for host]; 0s linux-sandbox
[200 / 439] Compiling external/com_github_google_protobuf/src/google/protobuf/extension_set.cc [for host]; 1s linux-sandbox
INFO: From ProtoCompile assets/assets/assets.pb.gw.go:
assets/assets/assets.proto: warning: Import recipes.proto but not used.
INFO: From ProtoCompile assets/assets/assets.swagger.json:
assets/assets/assets.proto: warning: Import recipes.proto but not used.
INFO: From ProtoCompile assets/assets/assets.pb.go:
assets/assets/assets.proto: warning: Import recipes.proto but not used.
[522 / 697] GoCompile vendor/github.com/gorilla/mux/~lib~/go_default_library.o; 0s linux-sandbox
Target //:docker up-to-date:
bazel-bin/docker-layer.tar
INFO: Elapsed time: 331.343s, Critical Path: 13.73s
INFO: Build completed successfully, 737 total actions

编辑：添加cloudbuild文件

cloudbuild.yaml：

steps:
- name: gcr.io/cloud-builders/bazel
  args: ['run', '//:docker']
- name: gcr.io/cloud-builders/docker
  args: ['tag', 'bazel:docker', '${_IMAGE_TAG}']
images: ['${_IMAGE_TAG}']