Updated docker support

docker/Dockerfile

@@ -1,13 +1,20 @@
-FROM node:18-buster-slim
+FROM --platform=${BUILDPLATFORM:-linux/amd64} node:20-bookworm-slim
+
+ARG TARGETPLATFORM
+ARG BUILDPLATFORM
+ARG TARGETOS
+ARG TARGETBRANCH
 
 LABEL maintainer="dave@force9.org"
 
 ENV NVM_DIR /root/.nvm
 ENV DEBIAN_FRONTEND noninteractive
-COPY . /enigma-bbs
 
-# Do some installing! (and alot of cleaning up) keeping it in one step for less docker layers
-# - if you need to debug i recommend to break the steps with individual RUNs)
+
+# Just copy the package.json so it only needs to build once
+COPY package.json /enigma-bbs
+
+# Install APT and NPM packages
 RUN apt-get update \
     && apt-get install -y \
     git \
@@ -22,9 +29,20 @@ RUN apt-get update \
     unrar-free \
     p7zip-full \
     dos2unix \
+    && npm set progress=false && npm config set depth 0 \
     && npm install -g npm@latest \
     && npm install -g pm2 \
-    && cd /enigma-bbs && npm install \
+    && cd /enigma-bbs && npm install
+
+
+# Do this after npm install to avoid cache-miss on every code change
+COPY . /enigma-bbs
+
+# Then run post source copy steps that have to happen every time
+RUN dos2unix /enigma-bbs/docker/bin/docker-entrypoint.sh \
+    && apt-get remove dos2unix -y \
+    && chmod +x /enigma-bbs/docker/bin/docker-entrypoint.sh \
+    && cp -f /enigma-bbs/docker/bin/sexyz /usr/local/bin \
     && pm2 start main.js \
     && mkdir -p /enigma-bbs-pre/art \
     && mkdir /enigma-bbs-pre/mods \
@@ -37,11 +55,6 @@ RUN apt-get update \
     && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
     && apt-get clean
 
-# sexyz
-COPY docker/bin/sexyz /usr/local/bin
-RUN dos2unix /enigma-bbs/docker/bin/docker-entrypoint.sh && apt-get remove dos2unix -y
-RUN chmod +x /enigma-bbs/docker/bin/docker-entrypoint.sh
-
 # enigma storage mounts
 VOLUME /enigma-bbs/art
 VOLUME /enigma-bbs/config