Include Vulkan SDK and ability to select build configuration

Dockerfile

@@ -1,16 +1,34 @@
-FROM ubuntu:focal AS build
+FROM ubuntu:focal AS rbdoom3bfg-buildenv
+ENV DEBIAN_FRONTEND=noninteractive
 
-ENV DEBIAN_FRONTEND noninteractive
+# Add the Vulkan SDK repository
+RUN apt-get update \
+    && apt-get install -y curl gpg\
+    && curl -Lso /tmp/lunarg-signing-key-pub.asc \
+        http://packages.lunarg.com/lunarg-signing-key-pub.asc \
+    && apt-key add /tmp/lunarg-signing-key-pub.asc \
+    && curl -Lso /etc/apt/sources.list.d/lunarg-vulkan-focal.list \
+        http://packages.lunarg.com/vulkan/lunarg-vulkan-focal.list
 
-ADD . /workspace
+# Install the general RBDoom3BFG dependencies
 RUN apt-get update \
     && apt-get install -y \
         build-essential git cmake \
-        libsdl2-dev libopenal-dev libavcodec-dev libavformat-dev libavutil-dev libswscale-dev
+        libsdl2-dev libopenal-dev vulkan-sdk \
+        libavcodec-dev libavformat-dev libavutil-dev libswscale-dev
+
+# From the previous build environment stage, actually run the build
+FROM rbdoom3bfg-buildenv AS build
 
+ARG CONFIGSCRIPT=cmake-eclipse-linux-profile.sh
+ENV CONFIGSCRIPT=${CONFIGSCRIPT}
+
+ADD . /workspace
 WORKDIR /workspace
-RUN cd neo && ./cmake-eclipse-linux-profile.sh
+RUN cd neo && ./${CONFIGSCRIPT}
 RUN cd build && make
 
+# Copy only the finished RBDoom3BFG executable to an empty image
+# for use with docker build --output
 FROM scratch AS export
 COPY --from=build /workspace/build/RBDoom3BFG /workspace/base/maps/ /

README.md

@@ -465,7 +465,10 @@ If your system has Docker installed, you can create RBDOOM3BFG builds without ha
 
 	> docker build . --output type=local,dest=./build
 
-This will run a build and save the resulting executables to `./build` on your host machine.
+This will run a build and save the resulting executables to `./build` on your host machine. By default, this will create a build using the `eclipse-linux-profile` configuration; to customize this you can also pass in the `CONFIGSCRIPT` build argument. For example, to create a build using the Vulkan release configuration:
+
+	> docker build . --output type=local,dest=./build --build-arg CONFIGSCRIPT=cmake-linux-vulkan-release.sh
+
 
 ## Local build