Add Containerfile to build node container (#42)

The first version is based on Debian, but that
choice shall be revisited later to optimize the
container size.

Containerfile

@@ -0,0 +1,32 @@
+FROM rust:1-bookworm
+
+COPY ./Cargo.* ./
+COPY ./crates ./crates
+
+RUN apt-get update && apt-get install -y \
+  libssl-dev \
+  protobuf-compiler
+
+RUN cargo build --release
+
+FROM debian:bookworm
+
+# Copy Gevulot node bin from earlier build step.
+COPY --from=0 target/release/gevulot /gevulot
+
+# Install QEMU.
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  ca-certificates \
+  curl \
+  qemu-system
+
+# Install Ops.
+RUN /bin/curl -Lo /bin/ops https://storage.googleapis.com/cli/linux/ops && chmod 755 /bin/ops && /bin/ops update
+
+COPY ./crates/node/migrations /migrations
+
+RUN mkdir -p /var/lib/gevulot
+RUN /gevulot generate node-key
+
+CMD ["run"]
+ENTRYPOINT ["/gevulot"]