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[build] mvn install in che-dev fails

See original GitHub issue

Description

I am trying to build Che locally, following the description here : https://github.com/eclipse/che/wiki/Development-Workflow#build-che-using-docker

It fails with:

...
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:43 min (Wall Clock)
[INFO] Finished at: 2017-10-11T08:12:29+00:00
[INFO] Final Memory: 307M/1717M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.8:run (build-image) on project che-dashboard-war: An Ant BuildException has occured: Execute failed: java.io.IOException: Cannot run program "docker" (in directory "/home/user/che-build/dashboard"): error=2, No such file or directory
[ERROR] around Ant part ...<exec failonerror="true" dir="/home/user/che-build/dashboard" executable="docker">... @ 4:85 in /home/user/che-build/dashboard/target/antrun/build-main.xml
...

Reproduction Steps

Clone Che
checkout 5.18.0
run

docker run -it --rm --name build-che \
           -v "$HOME/.m2:/home/user/.m2" \
           -v "$PWD":/home/user/che-build \
           -w /home/user/che-build \
           eclipse/che-dev \
           mvn -DskipTests=true \
               -Dfindbugs.skip=true \
               -Dgwt.compiler.localWorkers=2 -T 1C \
               -Dmdep.analyze.skip=true \
               -Dlicense.skip=true \
               clean install

OS and version:

OS X