Added Dockerfile and entrypoint.sh to build a docker image

Dockerfile

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+FROM golang:bookworm AS build
+WORKDIR /app
+COPY . .
+RUN go mod download \
+    && go build -tags=lmdb -ldflags "-X main.version=$(git describe --tags --always)" -o chronicle . \
+    && go clean -modcache
+
+FROM golang:bookworm
+COPY --from=build /app /app
+
+
+WORKDIR /app
+ENV RELAY_NAME="Cronicle Relay"
+ENV RELAY_DESCRIPTION="Nostr Personal Relay"
+ENV RELAY_PORT="3334"
+ENV DB_PATH="db/"
+ENV REFRESH_INTERVAL=24
+ENV MIN_FOLLOWERS=3
+ENV FETCH_SYNC="FALSE"
+VOLUME ["/app/db"]
+EXPOSE 3334
+ENTRYPOINT ["/app/entrypoint.sh"]

entrypoint.sh

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+#!/bin/bash
+
+# Define the output file
+OUTPUT_FILE=".env"
+
+# Define the required environment variables
+REQUIRED_VARS=("OWNER_PUBKEY")
+
+# Define the all environment variables
+ALL_VARS=("OWNER_PUBKEY" "RELAY_NAME" "RELAY_DESCRIPTION" "RELAY_URL" "RELAY_ICON" "RELAY_CONTACT" "DB_PATH" "REFRESH_INTERVAL" "MIN_FOLLOWERS" "FETCH_SYNC" "POW_WHITELIST" "POW_DM_WHITELIST")
+
+# Check if all required environment variables are set
+for var in "${REQUIRED_VARS[@]}"; do
+  if [ -z "${!var}" ]; then
+    echo "Error: Environment variable $var is not set."
+    exit 1
+  fi
+done
+
+#Recreate conf file
+truncate -s 0 $OUTPUT_FILE
+
+# Write environment variables to the output file
+for var in "${ALL_VARS[@]}"; do
+  echo "$var=`printenv ${var}`" >> "$OUTPUT_FILE"
+done
+
+./chronicle