repository and change the last RUN command in `projects/kea/Dockerfile` from
`RUN git clone https://gitlab.isc.org/isc-projects/kea kea` to
`RUN git clone https://gitlab.isc.org/isc-projects/kea --branch <branch_name> kea`,
repository and change the last RUN command in `projects/kea/Dockerfile` from
`RUN git clone https://gitlab.isc.org/isc-projects/kea kea` to
`RUN git clone https://gitlab.isc.org/isc-projects/kea --branch <branch_name> kea`,