Add Dockerfiles for ARM64 and ARMv7

docker/focal-arm64.Dockerfile

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+FROM arm64v8/ubuntu:focal
+LABEL org.opencontainers.image.source=https://github.com/fish-shell/fish-shell
+
+ENV LANG C.UTF-8
+ENV LC_ALL C.UTF-8
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+  && apt-get -y install \
+    build-essential \
+    cmake \
+    clang-9 \
+    gettext \
+    git \
+    libncurses5-dev \
+    libpcre2-dev \
+    locales \
+    ninja-build \
+    python3 \
+    python3-pexpect \
+    sudo \
+  && locale-gen en_US.UTF-8 \
+  && apt-get clean
+
+RUN groupadd -g 1000 fishuser \
+  && useradd -p $(openssl passwd -1 fish) -d /home/fishuser -m -u 1000 -g 1000 fishuser \
+  && adduser fishuser sudo \
+  && mkdir -p /home/fishuser/fish-build \
+  && mkdir /fish-source \
+  && chown -R fishuser:fishuser /home/fishuser /fish-source
+
+USER fishuser
+WORKDIR /home/fishuser
+
+COPY fish_run_tests.sh /
+
+
+CMD /fish_run_tests.sh

docker/jammy-armv7-32bit.Dockerfile

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+FROM arm32v7/ubuntu:jammy
+LABEL org.opencontainers.image.source=https://github.com/fish-shell/fish-shell
+
+ENV LANG C.UTF-8
+ENV LC_ALL C.UTF-8
+ENV CXXFLAGS="-Werror=address -Werror=return-type -Wno-psabi"
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+  && apt-get -y install \
+    build-essential \
+    cmake \
+    file \
+    g++ \
+    gettext \
+    git \
+    libncurses5-dev \
+    libpcre2-dev \
+    locales \
+    ninja-build \
+    pkg-config \
+    python3 \
+    python3-pexpect \
+    sudo \
+  && locale-gen en_US.UTF-8 \
+  && apt-get clean
+
+RUN groupadd -g 1000 fishuser \
+  && useradd -p $(openssl passwd -1 fish) -d /home/fishuser -m -u 1000 -g 1000 fishuser \
+  && adduser fishuser sudo \
+  && mkdir -p /home/fishuser/fish-build \
+  && mkdir /fish-source \
+  && chown -R fishuser:fishuser /home/fishuser /fish-source
+
+USER fishuser
+WORKDIR /home/fishuser
+
+COPY fish_run_tests.sh /
+
+
+CMD /fish_run_tests.sh