Ensure that docker tag is legal (#46035)
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TAG="${CIRRUS_TAG:-latest}"
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TAG="${CIRRUS_TAG:-latest}"
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# Convert "+" to "-" to make hotfix tags legal Docker tag names.
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# See https://docs.docker.com/engine/reference/commandline/tag/
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TAG=${TAG/+/-}
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# pull to make sure we are not rebuilding for nothing
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# pull to make sure we are not rebuilding for nothing
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sudo docker pull "gcr.io/flutter-cirrus/build-flutter-image:$TAG"
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sudo docker pull "gcr.io/flutter-cirrus/build-flutter-image:$TAG"
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