optimize Dockerfile (#13)

* optimize dockerfile

* fix syntax

Dockerfile

@@ -34,12 +34,28 @@ RUN dotnet_sdk_version=3.1.101 \
     # Trigger first run experience by running arbitrary cmd
     && dotnet help
 
+# Install toolchain to build NBlood and the supervisor
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        build-essential \
+        git \
+        libgl1-mesa-dev \
+        libglu1-mesa-dev \
+        libsdl-mixer1.2-dev \
+        libsdl1.2-dev \
+        libsdl2-dev \
+        libsdl2-mixer-dev \
+        nano \
+        nasm \
+        nginx \
+    && rm -rf /var/lib/apt/lists/*
+
 # Installing the NBlood supervisor related things
 WORKDIR /supervisor
 RUN mkdir -p publish/blood
-RUN apt-get update && apt-get install -y \
-    git \
-    nano
+
+# Disable cache from this point
+ARG CACHEBUST
 
 # Clone NBloodServerSupervisor
 RUN git clone https://github.com/CommonLoon102/NBloodServerSupervisor.git
@@ -48,17 +64,6 @@ RUN git clone https://github.com/CommonLoon102/NBloodServerSupervisor.git
 RUN dotnet publish NBloodServerSupervisor/NBloodServerSupervisor.sln --configuration Release --output publish --self-contained false --runtime linux-x64 \
     && sed -i -e "s/CHANGEME/$(< /dev/urandom tr -dc A-Za-z0-9 | head -c${1:-32};echo;)/g" publish/appsettings.json
 
-# Install toolchain to build NBlood
-RUN apt-get update && apt-get install -y \
-    build-essential \
-    libgl1-mesa-dev \
-    libglu1-mesa-dev \
-    libsdl-mixer1.2-dev \
-    libsdl1.2-dev \
-    libsdl2-dev \
-    libsdl2-mixer-dev \
-    nasm
-
 # Clone NBlood
 RUN git clone https://github.com/CommonLoon102/NBlood.git
 
@@ -67,9 +72,8 @@ RUN cd NBlood \
     && git checkout norender \
     && make blood NORENDER=1
 
-# Install and configure nginx
-RUN apt-get update && apt-get install -y nginx \
-    && printf '\
+# Configure nginx
+RUN printf '\
 server { \n\
     listen        23580; \n\
     location / { \n\

README.md

@@ -32,7 +32,7 @@ After you start the container, the following will happen:
 ## Deploy the server onto GNU/Linux
 1. Install Docker and wget (if you don't have already), for example like this: `sudo snap install docker && sudo apt install wget -y`
 2. Download the Dockerfile: `wget https://raw.githubusercontent.com/CommonLoon102/NBloodServerSupervisor/master/Dockerfile --directory-prefix=supervisor`
-3. Build the Docker image: `sudo docker build --no-cache -t nblood-supervisor:latest supervisor`
+3. Build the Docker image: `sudo docker build --build-arg CACHEBUST=$(date +%s) -t nblood-supervisor:latest supervisor`
 4. Navigate to your Blood 1.21 directory where you have the below files.
 The files are from stock Blood 1.21, Cryptic Passage, Death Wish 1.6.10 and The Way of Ira 1.0.1
 - BLOOD.INI