Add a production docker image build

Dockerfile

@@ -1,7 +1,30 @@
-FROM scratch
+# This Dockerfile is meant for production use only, binaries
+# are built against release targets and stripped of symbols.
 
+# First build stage, bluntly building a release target
+FROM rust:1.70.0-alpine as builder
+COPY ./Cargo.toml ./Cargo.lock ./
+COPY src ./src
+# Copy the git repository so that git_version can properly
+# guess the package version. This is not perfectly idiomatic.
+COPY .git ./.git
+ENV RUSTFLAGS='-C target-feature=+crt-static'
+ENV FEATURES=k2v,sled,lmdb,sqlite,consul-discovery,kubernetes-discovery,metrics,telemetry-otlp,bundled-libs 
+ENV TARGET=x86_64-unknown-linux-musl
+
+RUN apk add --no-cache musl-dev make git file protoc
+RUN cargo fetch
+RUN cargo build --release --features $FEATURES --target $TARGET \
+ && mv target/$TARGET/release/garage ./garage \
+ && strip ./garage
+
+# Second clean stage just copying over the static binary
+FROM scratch
 ENV RUST_BACKTRACE=1
 ENV RUST_LOG=garage=info
+COPY --from=builder ./garage /garage
+# Configuration is not included in the image and should be
+# mounted as a volume. No volume is explicitely declared for
+# this as there is no container-level persistence need.
+CMD /garage server -c /config.toml
 
-COPY result-bin/bin/garage /
-CMD [ "/garage", "server"]