chore: Add experimental docker build

Dockerfile

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+FROM ubuntu:22.04 AS base
+
+ENV DEBIAN_FRONTEND=noninteractive
+WORKDIR /fennix
+ADD . /fennix
+
+RUN apt -y update
+RUN apt -y install \
+	build-essential \
+	bison \
+	flex \
+	libgmp3-dev \
+	libmpc-dev \
+	libmpfr-dev \
+	texinfo \
+	libzstd-dev \
+	libisl-dev \
+	autoconf \
+	m4 \
+	automake \
+	gettext \
+	gperf \
+	dejagnu \
+	guile-3.0 \
+	guile-3.0-dev \
+	expect \
+	tcl \
+	autogen \
+	tex-common \
+	sphinx-common \
+	git \
+	ssh \
+	diffutils \
+	patch
+
+RUN apt clean && rm -rf /var/lib/apt/lists
+
+RUN make -C tools __clone_all_no_qemu
+RUN make --quiet -C tools do_binutils_64
+RUN make --quiet -C tools do_binutils_32
+RUN make --quiet -C tools do_gcc_64
+RUN make --quiet -C tools do_gcc_32
+RUN cd tools && rm -rf binutils-gdb gcc build-binutils64 build-gcc64 build-binutils32 build-gcc32
+
+RUN make build