Added docker build files

Dockerfile

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+FROM alpine:3.14 as builder
+ARG COMMIT=feature/cilium-compatibility-patch
+
+RUN apk add alpine-sdk build-base autoconf readline-dev bison flex ncurses-dev\
+             libssh linux-headers
+
+RUN git clone --depth 1 --branch ${COMMIT} https://github.com/tailify/bird
+WORKDIR bird
+
+RUN autoreconf --install
+
+RUN CFLAGS="-fcommon" ./configure --prefix=/usr --sysconfdir=/etc --runstatedir=/run
+
+RUN make -j && \
+    make install
+
+FROM alpine:3.14
+
+LABEL "org.opencontainers.image.source"="https://github.com/tailify/bird"
+
+ENV TZ=UTC
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
+
+RUN apk add --no-cache readline ncurses libssh bash
+
+COPY --from=builder /usr/sbin/bird* /usr/sbin/
+
+ENTRYPOINT /usr/sbin/bird -f
+

build-docker.sh

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+#!/usr/bin/env bash
+
+set -x -e
+
+tag=$1
+git tag -f "$tag" 
+git push -f origin "$tag"
+
+image_id="ghcr.io/tailify/bird:$tag"
+docker build -t "$image_id" --build-arg COMMIT=$tag .
+docker push "$image_id"