[#17] Wrote dockerfiles; moved everything to Docker

docker/Dockerfile.builder

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+# 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/

docker/Dockerfile.dev

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+FROM chewingbever/fej-builder:latest
+
+ENV RUST_BACKTRACE=1
+
+ENTRYPOINT ["cargo"]
+CMD ["run"]

docker/Dockerfile.rel

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+FROM chewingbever/fej-builder:latest AS builder
+
+# And then finally, build the project
+# Thank the lords that this article exists
+# https://users.rust-lang.org/t/sigsegv-with-program-linked-against-openssl-in-an-alpine-container/52172
+# TODO add what these flags do & why they work
+# NOTE: cargo install auto-appends bin to the path
+RUN --mount=type=cache,target=/usr/src/app/target \
+    --mount=type=cache,target=/root/.cargo/registry \
+    cargo install --path . --bin fej --root /usr/local
+
+
+# Now, we create the actual image
+FROM alpine:latest
+
+# Install some dynamic libraries needed for everything to work
+RUN apk update && apk add --no-cache openssl libgcc
+
+# Copy binary over to final image
+COPY --from=builder /usr/local/bin/fej /usr/local/bin/fej
+
+CMD ["/usr/local/bin/fej"]