Add updated Dockerfile

contrib/docker/Dockerfile

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+FROM alpine:latest
+LABEL authors "Mikal Villa <mikal@sigterm.no>, Darknet Villain <supervillain@riseup.net>"
+
+# Expose git branch, tag and URL variables as arguments
+ARG GIT_BRANCH="master"
+ENV GIT_BRANCH=${GIT_BRANCH}
+ARG GIT_TAG=""
+ENV GIT_TAG=${GIT_TAG}
+ARG REPO_URL="https://github.com/PurpleI2P/i2pd.git"
+ENV REPO_URL=${REPO_URL}
+
+ENV I2PD_HOME="/home/i2pd"
+ENV DATA_DIR="${I2PD_HOME}/data"
+
+RUN mkdir -p "$I2PD_HOME" \
+    && adduser -S -h "$I2PD_HOME" i2pd \
+    && chown -R i2pd:nobody "$I2PD_HOME"
+
+#
+# Each RUN is a layer, adding the dependencies and building i2pd in one layer takes around 8-900Mb, so to keep the 
+# image under 20mb we need to remove all the build dependencies in the same "RUN" / layer.
+#
+
+# 1. install deps, clone and build. 
+# 2. strip binaries. 
+# 3. Purge all dependencies and other unrelated packages, including build directory. 
+RUN apk --no-cache --virtual build-dependendencies add make gcc g++ libtool boost-dev build-base openssl-dev openssl git \
+    && mkdir -p /tmp/build \
+    && cd /tmp/build && git clone -b ${GIT_BRANCH} ${REPO_URL} \
+    && cd i2pd \
+    && if [ -n "${GIT_TAG}" ]; then git checkout tags/${GIT_TAG}; fi \
+    && make \
+    && cp -R contrib/certificates /i2pd_certificates \
+    && mkdir -p /usr/local/bin \
+    && mv i2pd /usr/local/bin \
+    && cd /usr/local/bin \
+    && strip i2pd \
+    && rm -fr /tmp/build && apk --purge del build-dependendencies build-base fortify-headers boost-dev zlib-dev openssl-dev \
+    boost-python3 python3 gdbm boost-unit_test_framework boost-python linux-headers boost-prg_exec_monitor \
+    boost-serialization boost-signals boost-wave boost-wserialization boost-math boost-graph boost-regex git pcre \
+    libtool g++ gcc pkgconfig
+
+# 2. Adding required libraries to run i2pd to ensure it will run.
+RUN apk --no-cache add boost-filesystem boost-system boost-program_options boost-date_time boost-thread boost-iostreams openssl musl-utils libstdc++
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod a+x /entrypoint.sh
+
+RUN echo "export DATA_DIR=${DATA_DIR}" >> /etc/profile
+VOLUME "$DATA_DIR"
+EXPOSE 7070 4444 4447 7656 2827 7654 7650
+USER i2pd
+
+ENTRYPOINT [ "/entrypoint.sh" ]

contrib/docker/entrypoint.sh

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+#!/bin/sh
+COMMAND=/usr/local/bin/i2pd
+# To make ports exposeable
+# Note: $DATA_DIR is defined in /etc/profile
+DEFAULT_ARGS=" --datadir=$DATA_DIR --reseed.verify=true --upnp.enabled=false --http.enabled=true --http.address=0.0.0.0 --httpproxy.enabled=true --httpproxy.address=0.0.0.0 --socksproxy.enabled=true --socksproxy.address=0.0.0.0 --sam.enabled=true --sam.address=0.0.0.0"
+
+if [ "$1" = "--help" ]; then
+    set -- $COMMAND --help
+else
+    # Create datadir 
+    mkdir -p "$DATA_DIR"
+    ln -s /i2pd_certificates "$DATA_DIR"/certificates
+    set -- $COMMAND $DEFAULT_ARGS $@
+fi
+
+exec "$@"