Add docker build & run env

Dockerfile.crawler

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+# Dockerfile to build the executable binary.
+# The executable is placed in /mc-crawler.
+# The config is copied from the builder stage (and thus verbose from the sources).
+
+# Get some small base image to run things on.
+FROM debian:bullseye-slim AS runtime
+
+# Create a system user to drop into.
+# This will get some small (<1000) UID and GID, which is fine since we don't write to any files.
+RUN groupadd -r mccrawler \
+    && useradd --no-log-init -r -g mccrawler mccrawler \
+    && mkdir -p mc-crawler
+
+# Install OS dependencies.
+RUN apt-get update && apt-get install -y \
+    libssl-dev \
+    build-essential #libc
+
+# cd to working dir
+WORKDIR mc-crawler
+
+# Copy compiled binaries from builder
+COPY --from=mc-crawler-builder /mc-crawler/target/release/mc-crawler .
+# Copy required file with bootstrap peers from builder
+COPY --from=mc-crawler-builder /mc-crawler/bootstrap.txt .
+
+# Set ownership.
+RUN chown -R mccrawler:mccrawler ./mc-crawler
+
+# Set SGX environment variables needed by mobilecoin libraries
+ENV IAS_MODE=DEV \
+    SGX_MODE=SW
+
+# Drop root.
+USER mccrawler
+
+# Run the binary.
+ENTRYPOINT ["./mc-crawler","--output","crawl_data", "-c"]

build-docker-images.sh

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+#!/bin/bash
+# This script builds two docker images in a multi-stage build, i.e. 
+    # 1. mc-crawler-builder - this produces an image with the compiled crawler
+    # 2. mc-crawler - the crawler is copied from the above image into a minimal runtime environment so as to keep the image size as small as possible
+
+docker build -t mc-crawler-builder -f Dockerfile.builder .
+docker build -t mc-crawler -f Dockerfile.crawler .