[ci] use background script

[fkorotkov]

There is a special instruction in Cirrus for that https://cirrus-ci.org/guide/writing-tasks/#background-script-instruction

Might be related to flutter/flutter#90078

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
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[ditman]

LGTM! Let's try this and see if it helps the repo recover!

[stuartmorgan-g]

We probably want this to be a separate script step that is background, and the rest to stay as-is.

[ditman]

      install_script:
        - git clone https://github.com/flutter/web_installers.git
        - cd web_installers/packages/web_drivers/
        - dart pub get
        - dart lib/web_driver_installer.dart chromedriver --install-only
      install_background_script:
        - ./chromedriver/chromedriver --port=4444

?

[fkorotkov]

See 02dac56

[ditman]

This is probably going to fail:

dart lib/web_driver_installer.dart chromedriver --install-only
Error when reading 'lib/web_driver_installer.dart': No such file or directory.

Does this need to cd at the beginning of the install_background_script (similarly to how we cd web_installers/packages/web_drivers/ at the beginning of install_script?)

[fkorotkov]

Does seems like it's working now: https://cirrus-ci.com/task/6037670892666880?logs=chromedriver#L10

Waiting for all the checks to pass.

[ditman]

I'll merge on red when the rest of the tests pass. Thanks @fkorotkov for the super fast fix!

[ditman]

@fkorotkov is this missing a log file? https://cirrus-ci.com/task/5474720939245568?logs=chromedriver

[fkorotkov]

@ditman it might failed to stream in real-time and will try to recover once the whole tasks finishes... Let's wait.

[stuartmorgan-g]

Do we know why the old version suddenly broke?

[ditman]

Web tests are running again:

• https://cirrus-ci.com/task/5474720939245568?logs=drive#L104
• https://cirrus-ci.com/task/6037670892666880?logs=drive#L57

[fkorotkov]

@stuartmorgan yeah, seems this is the reason flutter/flutter#90078 (comment)

[stuartmorgan-g]

I'll merge on red when the rest of the tests pass. Thanks @fkorotkov for the super fast fix!

Since this can't possible affect any tasks other than the one in changed, and those are green, I'm going to land now to green the tree.