Refactor: build env

Dockerfile

@@ -0,0 +1,20 @@
+FROM docker.io/library/ubuntu:22.04
+
+RUN dpkg --add-architecture i386 && \
+  apt-get update && apt-get -y dist-upgrade && apt-get -y install \
+    build-essential ed \
+    gcc-multilib g++-multilib \
+    lib32ncurses5-dev lib32z1 \
+    zlib1g:i386 libncurses5:i386 \
+    libgcc1:i386 libstdc++5:i386
+
+WORKDIR /
+COPY mips-decstation.linux-xgcc.gz /
+RUN tar -zxvf /mips-decstation.linux-xgcc.gz
+
+WORKDIR /work
+
+COPY . .
+
+ENTRYPOINT ["make"]
+CMD ["-C", "code"]