build: add dockerfile to build greptimedb container image (#194)

docker/Dockerfile

@@ -0,0 +1,32 @@
+FROM ubuntu:22.04 as builder
+
+ENV LANG en_US.utf8
+WORKDIR /greptimedb
+
+# Install dependencies.
+RUN apt-get update && apt-get install -y \
+    libssl-dev \
+    protobuf-compiler \
+    curl \
+    build-essential \
+    pkg-config
+
+# Install Rust.
+SHELL ["/bin/bash", "-c"]
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --no-modify-path --default-toolchain none -y
+ENV PATH /root/.cargo/bin/:$PATH
+
+# Build the project in release mode.
+COPY . .
+RUN cargo build --release
+
+# Export the binary to the clean image.
+# TODO(zyy17): Maybe should use the more secure container image.
+FROM ubuntu:22.04 as base
+
+WORKDIR /greptimedb
+COPY --from=builder /greptimedb/target/release/greptime /greptimedb/bin/
+ENV PATH /greptimedb/bin/:$PATH
+
+ENTRYPOINT [ "greptime" ]
+CMD [ "datanode", "start"]