Addidng Dockerfile for artix devel env and script/example of usage.

tools/artix-dinit-dev-env/Dockerfile

@@ -0,0 +1,26 @@
+FROM artixlinux/artixlinux:base-dinit
+
+# Install necessary build tools
+RUN pacman -Suy --noconfirm base-devel git wget sudo make pacman-contrib
+
+# Config to use 16 thread for building
+RUN printf 'MAKEFLAGS="-j16"\n' > /etc/makepkg.conf.d/j16.conf
+
+# Create a build user
+RUN useradd -m builduser \
+    && passwd -d builduser \
+    && printf 'builduser ALL=(ALL) ALL\n' >> /etc/sudoers
+
+# Set working directory
+WORKDIR /home/builduser
+
+# Build the package as the non-root user
+# -s: install missing dependencies
+# -c: clean build directory after successful build
+# --noconfirm: auto-confirm prompts
+USER builduser
+
+# Do NOT copy source code or run makepkg here.
+# Leave the container ready to accept any mounted directory.
+CMD ["bash"]
+