dockerfile: add Dockerfile.tmpl

Fixes: afae962c ("dockerfile: extract a common part in one file")
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

scripts/build/Dockerfile.tmpl

+RUN apt-get update
+
+RUN apt-get update && apt-get install -y \
+                build-essential \
+                protobuf-c-compiler \
+                libprotobuf-c0-dev \
+                libprotobuf-dev \
+                bsdmainutils \
+                protobuf-compiler \
+                python-minimal \
+                libaio-dev \
+                iptables \
+                libnl-3-dev
+
+COPY . /criu
+WORKDIR /criu
+
+RUN make clean && make -j $(nproc)