[#17] Wrote dockerfiles; moved everything to Docker

docker/Dockerfile.builder

@@ -0,0 +1,19 @@
+# We use a multi-stage build to end up with a very small final image
+FROM alpine:latest AS builder
+
+ARG MODE
+ARG RUN_TESTS
+
+ENV PATH "$PATH:/root/.cargo/bin"
+# Needed for proper compiling of openssl-dev
+ENV RUSTFLAGS="-C target-feature=-crt-static"
+
+WORKDIR /usr/src/app
+
+# Install build dependencies, rustup & rust's nightly build & toolchain
+RUN apk update && apk add --no-cache openssl-dev build-base curl && \
+    { curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain nightly; }
+
+# Copy source code over to builder
+COPY Cargo.toml Cargo.lock ./
+COPY src/ ./src/