atheme-docker first pass

Dockerfile

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+FROM alpine:3.11
+
+ARG ATHEME_VERSION=7.2.10-r2
+ARG CONFIGURE_ARGS=--enable-contrib
+ARG ATHEME_UID=10000
+
+RUN adduser -D -h /atheme -u $ATHEME_UID atheme
+RUN mkdir /atheme-src
+
+# Install build-deps
+RUN apk add --no-cache --virtual .build-deps \
+    build-base \
+    pkgconf \
+    openssl-dev \
+    # Used by contrib/gen_echoserver.so
+    libexecinfo-dev \
+    git
+# Runtime deps
+RUN apk add openssl libexecinfo
+
+# Checkout from Git - we need to manually bump the libmowgli snapshot to fix compilation against musl
+# This will be fixed when 7.3 releases
+RUN git clone https://github.com/atheme/atheme -b v${ATHEME_VERSION} atheme-src --recursive
+RUN cd /atheme-src/libmowgli-2 && git pull origin master
+
+# Configure and build
+RUN cd /atheme-src && \
+    ./configure --prefix=/atheme $CONFIGURE_ARGS
+RUN cd /atheme-src && \
+    make -j$(nproc) && make install
+
+# Remove source dir and build deps
+RUN rm -rf /atheme-src && apk del .build-deps
+
+RUN chown -R atheme /atheme
+USER atheme
+# Services config
+VOLUME /atheme/etc
+# Services DB
+VOLUME /atheme/var
+
+ENTRYPOINT ["/atheme/bin/atheme-services", "-n"]

README.md

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+# atheme-docker
+
+Unofficial Docker image for [Atheme IRC Services](https://github.com/atheme/atheme), based off Alpine.
+