embed steam Half-Life data into the image itself

allows also adding hlsdk libs to the image
makes it easier to build, manage, and run

container/Containerfile

@@ -1,15 +1,17 @@
-FROM ubuntu:24.04
+FROM ubuntu-hlsdk
 
 # Avoid interactive prompts during package installation
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Set working directory
-WORKDIR /build
+USER root
+
+# Install Vulkan SDK repos
+RUN wget -qO- https://packages.lunarg.com/lunarg-signing-key-pub.asc | tee /etc/apt/trusted.gpg.d/lunarg.asc \
+	&& wget -qO /etc/apt/sources.list.d/lunarg-vulkan-noble.list http://packages.lunarg.com/vulkan/lunarg-vulkan-noble.list
 
 # Install system dependencies and development packages
 RUN apt-get update && apt-get install --no-install-recommends --no-install-suggests -y \
-    wget \
-    build-essential \
+    vulkan-sdk \
     libsdl2-dev \
     libfreetype-dev \
     \
@@ -24,11 +26,6 @@ RUN apt-get update && apt-get install --no-install-recommends --no-install-sugge
     libpostproc-dev \
     ffmpeg \
     \
-    # Utilities
-    pkg-config \
-    python3 \
-    python3-pip \
-    \
     # Running render tests
     weston \
     libgl1-mesa-dri \
@@ -36,16 +33,11 @@ RUN apt-get update && apt-get install --no-install-recommends --no-install-sugge
     libvulkan1 \
     imagemagick
 
-RUN wget -qO- https://packages.lunarg.com/lunarg-signing-key-pub.asc | tee /etc/apt/trusted.gpg.d/lunarg.asc \
-	&& wget -qO /etc/apt/sources.list.d/lunarg-vulkan-noble.list http://packages.lunarg.com/vulkan/lunarg-vulkan-noble.list \
-	&& apt update \
-	&& apt install --no-install-recommends --no-install-suggests -y vulkan-sdk
-
 # Remove extra cache after all the installations
 RUN rm -rf /var/lib/apt/lists/*
 
-RUN chown -R ubuntu:ubuntu /build
-
+# Set working directory
+WORKDIR /build
 COPY build-and-test.sh /build/
 
 # Switch to non-root user