Add docker container config files

Dockerfile

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+FROM ubuntu:20.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt update \
+    && apt upgrade -y \
+    && apt install -y --no-install-recommends \
+    build-essential gcc-multilib g++-multilib cmake git zip
+
+WORKDIR /usr/src/creamlinux

docker-compose.yml

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+services:
+  creamlinux-build:
+    build: .
+    container_name: creamlinux_build
+    volumes:
+      - .:/usr/src/creamlinux/
+    command: bash -c "sh ./build.sh && cd output && zip -r creamlinux.zip *"