Initial docker setup using rust-musl-builder

Not working yet because sqlx 0.3 doesn't have an offline mode

Dockerfile

@@ -0,0 +1,22 @@
+# -*- mode: dockerfile -*-
+
+# You can override this `--build-arg BASE_IMAGE=...` to use different
+# version of Rust or OpenSSL.
+ARG BASE_IMAGE=ekidd/rust-musl-builder:nightly-2020-10-08
+
+# Our first FROM statement declares the build environment.
+FROM ${BASE_IMAGE} AS builder
+
+# Add our source code.
+ADD --chown=rust:rust . ./
+
+# Build our application.
+RUN cargo build --release
+
+# Now, we need to build our _real_ Docker container, copying in `using-sqlx`.
+FROM alpine:latest
+RUN apk --no-cache add ca-certificates
+COPY --from=builder \
+    /home/rust/src/target/x86_64-unknown-linux-musl/release/bazaar_realm_api \
+    /usr/local/bin/
+CMD /usr/local/bin/bazaar_realm_api