Add Dockerfile

Signed-off-by: Sebastian Hasler <sebastian.hasler@stuvus.uni-stuttgart.de>

docker/Dockerfile

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+FROM rust:1.48-alpine AS build
+
+ARG REV=master
+
+RUN apk add --no-cache \
+    clang-libs \
+    curl \
+    libc-dev \
+    libnice-dev \
+    openssl-dev \
+    ;
+WORKDIR /src
+RUN curl https://codeload.github.com/Johni0702/mumble-web-proxy/tar.gz/$REV \
+    | tar -xzf - --strip-components 1
+RUN echo -e '\n[dependencies."async-trait"]\ndefault-features = false' >> Cargo.toml
+RUN RUSTFLAGS="-C target-feature=-crt-static" cargo install --path .
+
+FROM alpine
+
+RUN apk add --no-cache \
+    bash \
+    libgcc \
+    libnice \
+    ;
+COPY --from=build /usr/local/cargo/bin/mumble-web-proxy /mumble-web-proxy
+COPY entrypoint.sh /entrypoint.sh
+
+ENV MWP_LISTEN_WS=64737
+ENV MWP_SERVER=mumble-server:64738
+ENV MWP_ACCEPT_INVALID_CERTIFICATE=
+ENV MWP_ICE_PORT_MIN=
+ENV MWP_ICE_PORT_MAX=
+ENV MWP_ICE_IPV4=
+ENV MWP_ICE_IPV6=
+
+CMD ["/entrypoint.sh"]
+USER 1000
+EXPOSE 64737

docker/README.md

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+# mumble-web-proxy OCI image
+
+This directory provides files to build a mumble-web-proxy OCI image.
+The image is based on Alpine Linux and is less than 30 MiB in size.
+One can use [Docker](https://www.docker.com/) in order to build the image,
+as follows.
+
+```
+docker build --build-arg REV=master -t mumble-web-proxy .
+```
+
+`master` can be replaced by any revision (i.e. branch, tag or commit hash) of
+this repository.

docker/entrypoint.sh

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+#!/usr/bin/env bash
+
+cmd=("/mumble-web-proxy" "--listen-ws=$MWP_LISTEN_WS" "--server=$MWP_SERVER")
+
+if [ "$MWP_ACCEPT_INVALID_CERTIFICATE" = true ]; then
+  cmd+=("--accept-invalid-certificate")
+fi
+
+if [ -n "$MWP_ICE_PORT_MIN" ]; then
+  cmd+=("--ice-port-min=$MWP_ICE_PORT_MIN")
+fi
+
+if [ -n "$MWP_ICE_PORT_MAX" ]; then
+  cmd+=("--ice-port-max=$MWP_ICE_PORT_MAX")
+fi
+
+if [ -n "$MWP_ICE_IPV4" ]; then
+  cmd+=("--ice-ipv4=$MWP_ICE_IPV4")
+fi
+
+if [ -n "$MWP_ICE_IPV6" ]; then
+  cmd+=("--ice-ipv6=$MWP_ICE_IPV6")
+fi
+
+exec "${cmd[@]}"