change the current sonic build slightly

sonic/Dockerfile

@@ -1,10 +1,3 @@
-# Running Sonic in Docker is Experimental - not recommended for production use!
-
-# Example of usage:
-# docker build -t sonic .
-# docker run --name sonic1 --entrypoint sonictool sonic --datadir=/var/sonic genesis fake 1
-# docker run --volumes-from sonic1 -p 5050:5050 -p 5050:5050/udp -p 18545:18545 sonic --fakenet 1/1 --http --http.addr=0.0.0.0
-
 FROM golang:1.22 as builder
 
 ARG VERSION
@@ -24,10 +17,11 @@ FROM golang:1.22
 COPY --from=builder /go/sonic/build/sonicd /usr/local/bin/
 COPY --from=builder /go/sonic/build/sonictool /usr/local/bin/
 
-COPY ./entrypoint.sh /entrypoint.sh
+COPY ./entrypoint.sh /usr/local/bin/entrypoint.sh
+RUM chmod +x /usr/local/bin/entrypoint.sh
 
 EXPOSE 18545 18546 5050 5050/udp
 
 VOLUME /var/sonic
 
-ENTRYPOINT ["bash", "/entrypoint.sh"]
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]

sonic/entrypoint.sh

@@ -1,25 +1,23 @@
 #!/bin/bash
 
-if [ ! -f /var/sonic/initialized ]; then
+datadir=/var/sonic
+
+if [ ! -f "$datadir/initialized" ]; then
     echo "Initializing Sonic..."
 
-    # Add your initialization commands here
-    # Example:
-    # mkdir -p /var/sonic/data
-    # touch /var/sonic/config.json
+    url="${GENESIS:-https://genesis.soniclabs.com/sonic-mainnet/genesis/sonic.g}"
+    filename=$(basename "$url")
     
-    wget https://genesis.soniclabs.com/sonic-mainnet/genesis/sonic.g
-    GOMEMLIMIT=50GiB sonictool --datadir /var/sonic --cache 12000 genesis sonic.g
-    rm sonic.g
+    wget -P "$datadir" "$url"
 
-    # Create the file to mark initialization
-    touch /var/sonic/initialized
+    GOMEMLIMIT="${CACHE_GB}GiB" sonictool --datadir "$datadir" --cache "${CACHE_GB}000" genesis "$datadir/$filename"
+    rm "$datadir/$filename"
+    
+    touch "$datadir/initialized"
 
     echo "Initialization complete."
 else
     echo "Sonic is already initialized."
 fi
 
-touch /var/sonic/initialized
-
-exec sonicd --datadir /var/sonic "$@"
+exec sonicd --cache "${CACHE_GB}000" --datadir "$datadir" "$@"