Migrate che-docs release process from ci centos to GH action

[nickboldt]

Is your task related to a problem? Please describe.

Currently we have this code running for each Che release of the docs:

releaseCheDocs() {
    tmpdir="$(mktemp -d)"
    pushd "${tmpdir}" >/dev/null || exit
    projectPath=eclipse/che-docs
    rm -f ./make-release.sh && curl -sSLO "https://raw.githubusercontent.com/${projectPath}/master/make-release.sh" && chmod +x ./make-release.sh
    ./make-release.sh --repo "[email protected]:${projectPath}" --version "${CHE_VERSION}" --trigger-release
    popd >/dev/null || exit 
}

# then later ... 

# Release of Che docs does not depend on server, so trigger and don't wait
set +x
if [[ ${PHASES} == *"4"* ]]; then
    releaseCheDocs &
fi

Describe the solution you'd like

Wrap the above code in a GH action and run it via workflow / API call from the che-docs repo.

[nickboldt]

Followup task in #18864