Add a crate to test the runtime can be reproducibly built

orchestration/runtime/Dockerfile

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+FROM rust:1.71.0-slim-bookworm as builder
+
+# Add files for build
+ADD common /serai/common
+ADD crypto /serai/crypto
+ADD coins /serai/coins
+ADD message-queue /serai/message-queue
+ADD processor /serai/processor
+ADD coordinator /serai/coordinator
+ADD substrate /serai/substrate
+ADD tests /serai/tests
+ADD Cargo.toml /serai
+ADD Cargo.lock /serai
+ADD AGPL-3.0 /serai
+
+WORKDIR /serai
+
+# Move to a Debian package snapshot
+RUN rm -rf /etc/apt/sources.list.d/debian.sources && \
+  rm -rf /var/lib/apt/lists/* && \
+  echo "deb [arch=amd64] http://snapshot.debian.org/archive/debian/20230703T000000Z bookworm main" > /etc/apt/sources.list && \
+  apt update
+
+# Install dependencies
+RUN apt install clang -y
+
+# Add the wasm toolchain
+RUN rustup target add wasm32-unknown-unknown