add docker support

Dockerfile

@@ -0,0 +1,38 @@
+# Use the official Ubuntu 24.04 image as the base image
+FROM ubuntu:24.04
+
+# Set the working directory
+WORKDIR /usr/src/app
+
+# Install necessary dependencies
+RUN apt-get update && apt-get install -y \
+    curl \
+    protobuf-compiler \
+    xz-utils
+
+# Copy the source code and flake.nix into the container
+COPY . /usr/src/app
+
+# Create /nix directory and set permissions
+USER root
+RUN mkdir -m 0755 /nix && chown root /nix
+
+# Create nixbld group and users
+RUN groupadd -g 30000 nixbld && \
+    for i in $(seq 1 10); do \
+        useradd -u $((30000 + i)) -g nixbld -G nixbld -m -s /bin/false nixbld$i; \
+    done
+
+# Install Nix and set up the environment
+RUN curl -L https://nixos.org/nix/install | sh -s -- --daemon && \
+    /bin/bash -c "source /root/.nix-profile/etc/profile.d/nix.sh && \
+    exec bash -l -c 'nix-channel --update && nix-env -iA nixpkgs.nix'"
+
+# Start the Nix daemon and develop the environment
+RUN /bin/bash -c "source /root/.nix-profile/etc/profile.d/nix.sh && \
+    /root/.nix-profile/bin/nix-daemon & \
+    cd /usr/src/app && \
+    /root/.nix-profile/bin/nix develop --extra-experimental-features nix-command --extra-experimental-features flakes --command cargo build --release --bin cdk-mintd"
+
+# Set the entry point for the container
+CMD ["/usr/src/app/target/release/cdk-mintd"]