Add Dockerfile to build Ubuntu builds in containers.

.dockerignore

@@ -0,0 +1,2 @@
+Dockerfile
+build

Dockerfile

@@ -0,0 +1,34 @@
+FROM ubuntu:focal AS rbdoom3bfg-buildenv
+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
+
+# Install the general RBDoom3BFG dependencies
+RUN apt-get update \
+    && apt-get install -y \
+        build-essential git cmake \
+        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=${CONFIGSCRIPT}
+
+ADD . /workspace
+WORKDIR /workspace
+RUN cd neo && ./${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

@@ -459,6 +459,19 @@ Recommended in this case is `cmake-vs2017-64bit-windows10.bat`
 ---
 # Compiling on Linux <a name="compile_linux"></a>
 
+## Containerised build
+
+If your system has Docker installed, you can create RBDOOM3BFG builds without having to install any of the dependencies on your host system. There is a `Dockerfile` in this repository that will set up the environment inside an `ubuntu` container and run the build for you. To run a build inside a Docker container, simply run the following command in the root path of this repository:
+
+	> docker build . --output type=local,dest=./build
+
+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
+
 1. You need the following dependencies in order to compile RBDoom3BFG with all features:
 
 	On Debian or Ubuntu: