[Alpine] Add Dockerfile and Document

docker/alpine/latest/base/Dockerfile

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+ARG dist=alpine
+ARG tag=latest
+FROM ${dist}:${tag}
+
+MAINTAINER Sukchan Lee <acetcom@gmail.com>
+
+RUN apk update && \
+    apk add --no-cache \
+        alpine-sdk \
+        bison \
+        flex \
+        git \
+        meson \
+        bash \
+        linux-headers \
+        bsd-compat-headers \
+        yaml-dev \
+        lksctp-tools-dev \
+        gnutls-dev \
+        libgcrypt-dev \
+        libidn-dev \
+        mongo-c-driver-dev \
+        libmicrohttpd-dev \
+        curl-dev \
+        nghttp2-dev \
+        iproute2

docker/alpine/latest/dev/Dockerfile

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+ARG dist=alpine
+ARG tag=latest
+ARG username=acetcom
+FROM ${username}/${dist}-${tag}-open5gs-base
+
+MAINTAINER Sukchan Lee <acetcom@gmail.com>
+
+COPY setup.sh /root
+
+RUN apk update && \
+    apk add --no-cache \
+        vim \
+        sudo
+
+ARG username=acetcom
+RUN adduser -u 1000 acetcom -D && \
+    echo "${username} ALL=(root) NOPASSWD:ALL" > /etc/sudoers.d/${username} && \
+    chmod 0440 /etc/sudoers.d/${username}
+
+WORKDIR /home/${username}

docker/alpine/latest/dev/setup.sh

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+#!/bin/sh
+
+if ! grep "ogstun" /proc/net/dev > /dev/null; then
+    ip tuntap add name ogstun mode tun
+fi
+ip addr del 10.45.0.1/16 dev ogstun 2> /dev/null
+ip addr add 10.45.0.1/16 dev ogstun
+ip addr del 2001:230:cafe::1/48 dev ogstun 2> /dev/null
+ip addr add 2001:230:cafe::1/48 dev ogstun
+ip link set ogstun up