docker: added Dockerfile

scripts/Dockerfile

+FROM cznic/knot:latest
+MAINTAINER Marek Vavrusa <marek.vavrusa@nic.cz>
+
+# Install libuv
+RUN mkdir /src; \
+git clone https://github.com/libuv/libuv.git /src/libuv; \
+cd /src/libuv; \
+sh autogen.sh && ./configure && make && make install && ldconfig; \
+rm -rf /src/libuv
+
+# Install knot-resolver
+RUN apt-get -q -y update; \
+apt-get install -q -y \
+libcmocka-dev; \
+git clone https://gitlab.labs.nic.cz/knot/resolver.git /src/knot-resolver; \
+cd /src/knot-resolver; \
+autoreconf -if && ./configure && make && make check && make install && ldconfig; \
+# Trim down the image
+apt-get clean; \
+rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /src/knot-resolver
+
+# Select entrypoint
+WORKDIR /root
+CMD ["/usr/local/sbin/kresolved", "-a", "0.0.0.0#53"]
+
+# Expose port
+EXPOSE 53