dockerfile for x64 and arm building with musl

docker/dev/Dockerfile.m

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+
+ARG RUST_BUILDER_IMAGE=shtripok/rust-musl-builder:arm
+
+FROM $RUST_BUILDER_IMAGE as rust
+
+#ARG RUSTRELEASEDIR="debug"
+ARG RUSTRELEASEDIR="release"
+
+# Cache deps
+WORKDIR /app
+RUN sudo chown -R rust:rust .
+RUN USER=root cargo new server
+WORKDIR /app/server
+COPY --chown=rust:rust server/Cargo.toml server/Cargo.lock ./
+#RUN sudo chown -R rust:rust .
+RUN mkdir -p ./src/bin \
+   && echo 'fn main() { println!("Dummy") }' > ./src/bin/main.rs
+RUN cargo build --release
+RUN rm -f ./target/$CARGO_BUILD_TARGET/$RUSTRELEASEDIR/deps/lemmy_server*
+COPY --chown=rust:rust server/src ./src/
+COPY --chown=rust:rust server/migrations ./migrations/
+#USER root
+#RUN sudo chown -R rust:rust /app/server
+#USER rust
+
+# build for release
+# workaround for https://github.com/rust-lang/rust/issues/62896
+#RUN RUSTFLAGS='-Ccodegen-units=1' cargo build --release
+RUN cargo build --frozen --release
+#RUN cargo build --release
+
+# Get diesel-cli on there just in case
+# RUN cargo install diesel_cli --no-default-features --features postgres
+
+RUN cp ./target/$CARGO_BUILD_TARGET/$RUSTRELEASEDIR/lemmy_server /app/server/
+
+
+FROM $RUST_BUILDER_IMAGE as docs
+WORKDIR /app
+COPY --chown=rust:rust docs ./docs
+#RUN sudo chown -R rust:rust .
+RUN mdbook build docs/
+
+
+FROM node:12-buster as node
+
+WORKDIR /app/ui
+
+# Cache deps
+COPY ui/package.json ui/yarn.lock ./
+RUN yarn install --pure-lockfile --network-timeout 600000
+
+# Build
+COPY ui /app/ui
+RUN yarn build
+
+
+FROM alpine:3.10 as lemmy
+
+# Install libpq for postgres
+RUN apk add libpq
+RUN addgroup -g 1000 lemmy
+RUN adduser -D -s /bin/sh -u 1000 -G lemmy lemmy
+
+# Copy resources
+COPY --chown=lemmy:lemmy server/config/defaults.hjson /config/defaults.hjson
+COPY --chown=lemmy:lemmy --from=rust /app/server/lemmy_server /app/lemmy
+COPY --chown=lemmy:lemmy --from=docs /app/docs/book/ /app/dist/documentation/
+COPY --chown=lemmy:lemmy --from=node /app/ui/dist /app/dist
+
+RUN chown lemmy:lemmy /app/lemmy
+USER lemmy
+EXPOSE 8536
+CMD ["/app/lemmy"]