ADD docker support (#17)

ADD docker support

Dockerfile

@@ -0,0 +1,21 @@
+FROM debian:12 AS builder
+COPY . /srv/
+RUN apt update 
+RUN apt -y install build-essential libboost-all-dev libssl-dev 
+WORKDIR /srv
+RUN make
+
+FROM debian:12
+RUN apt update && \
+    apt install -y libssl3 --no-install-recommends && \
+    apt clean && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+WORKDIR /home/dnsseed
+COPY --from=builder /srv/dnsseed /home/dnsseed/
+COPY entrypoint.sh /
+
+# Set the entrypoint to your script
+ENTRYPOINT ["/entrypoint.sh"]
+
+# Default CMD if no arguments are provided (this can be overwritten at runtime)
+CMD ["/home/dnsseed/dnsseed"]

entrypoint.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+set -ex
+
+# Default values for environment variables if not set
+export SEED_HOSTNAME=${SEED_HOSTNAME}
+export NODE_HOSTNAME=${NODE_HOSTNAME}
+export EMAIL=${EMAIL}
+export THREADS=${THREADS}
+export ADDRESS=${ADDRESS:-"0.0.0.0"}
+export PORT=${PORT:-"53"}
+export NETWORK=${NETWORK:-"mainnet"}  # Default to "mainnet" unless otherwise set
+
+# Extra arguments for testnet
+extra_args=""
+if [[ "$NETWORK" == "testnet" ]]; then
+  export extra_args="--testnet"
+fi
+
+# If the first argument starts with a hyphen (-), consider it an argument for the dnsseed binary
+if [[ "${1:0:1}" == "-" ]]; then
+  exec /home/dnsseed/dnsseed "$@"
+fi
+
+# Run the dnsseed binary with default arguments and extra_args, or run another command if provided
+if [ "$1" == "/home/dnsseed/dnsseed" ]; then
+  exec /home/dnsseed/dnsseed -h "$SEED_HOSTNAME" \
+    -n "$NODE_HOSTNAME" \
+    -a "$ADDRESS" \
+    -p "$PORT" \
+    -m "$EMAIL" \
+    -t "$THREADS" "$extra_args"
+else
+  # If another command is passed, run that instead
+  exec "$@"
+fi