heptapod-ci: add a script to map evolve branch to mercurial revision for tests map-hg-rev.sh can be tested using this command: ```sh for i in $(hg log -T '{branch}\n' | sort -u); do echo $i $(testlib/map-hg-rev.sh $i) done ```

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#!/bin/sh

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set -eu

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case $1 in

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    default)

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        echo default

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        ;;

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    mercurial-*)

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        exp=$(echo "$1" | cut -d- -f2 | sed 's#\.#\\.#g')

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        echo 'max(tag("re:^'"$exp"'"))'

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        ;;

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    *)

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        echo stable

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        ;;

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esac