Ubuntu Noble Numbat dockerfile

Currently pinned to rustc 1.75 but only because this is what we use on OBS.

docker/noble.Dockerfile

@@ -0,0 +1,40 @@
+FROM ubuntu:noble
+LABEL org.opencontainers.image.source=https://github.com/fish-shell/fish-shell
+
+ENV LANG C.UTF-8
+ENV LC_ALL C.UTF-8
+
+RUN apt-get update \
+  && apt-get -y install \
+    build-essential \
+    cmake \
+    gettext \
+    git \
+    libpcre2-dev \
+    locales \
+    ninja-build \
+    python3 \
+    python3-pexpect \
+    tmux \
+    rustc \
+    sudo \
+  && locale-gen en_US.UTF-8 \
+  && apt-get clean
+
+RUN groupadd -g 1001 fishuser \
+  && useradd -p $(openssl passwd -1 fish) -d /home/fishuser -m -u 1001 -g 1001 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
+
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > /tmp/rustup.sh \
+  && sh /tmp/rustup.sh -y --default-toolchain 1.75
+
+COPY fish_run_tests.sh /
+
+CMD . ~/.cargo/env \
+  && /fish_run_tests.sh