initial buildroot for linux 5.15

support/docker/Dockerfile

@@ -0,0 +1,63 @@
+# This Dockerfile generates the docker image that gets used by Gitlab CI
+# To build it (YYYYMMDD.HHMM is the current date and time in UTC):
+#   docker build -t registry.gitlab.com/buildroot.org/buildroot/base:YYYYMMDD.HHMM support/docker
+#   docker push registry.gitlab.com/buildroot.org/buildroot/base:YYYYMMDD.HHMM
+
+# We use a specific tag for the base image *and* the corresponding date
+# for the repository., so do not forget to update the apt-sources.list
+# file that is shipped next to this Dockerfile.
+FROM debian:bullseye-20210902
+
+LABEL maintainer="Buildroot mailing list <buildroot@buildroot.org>" \
+      vendor="Buildroot" \
+description="Container with everything needed to run Buildroot"
+
+# Setup environment
+ENV DEBIAN_FRONTEND noninteractive
+
+# This repository can be a bit slow at times. Don't panic...
+COPY apt-sources.list /etc/apt/sources.list
+
+# The container has no package lists, so need to update first
+RUN dpkg --add-architecture i386 && \
+    apt-get update -y
+RUN apt-get install -y --no-install-recommends \
+        bc \
+        build-essential \
+        bzr \
+        ca-certificates \
+        cmake \
+        cpio \
+        cvs \
+        file \
+        g++-multilib \
+        git \
+        libc6:i386 \
+        libncurses5-dev \
+        locales \
+        mercurial \
+        python3 \
+        python3-flake8 \
+        python3-nose2 \
+        python3-pexpect \
+        qemu-system-arm \
+        qemu-system-x86 \
+        rsync \
+        subversion \
+        unzip \
+        wget \
+        && \
+    apt-get -y autoremove && \
+    apt-get -y clean
+
+# To be able to generate a toolchain with locales, enable one UTF-8 locale
+RUN sed -i 's/# \(en_US.UTF-8\)/\1/' /etc/locale.gen && \
+    /usr/sbin/locale-gen
+
+RUN useradd -ms /bin/bash br-user && \
+    chown -R br-user:br-user /home/br-user
+
+USER br-user
+WORKDIR /home/br-user
+ENV HOME /home/br-user
+ENV LC_ALL en_US.UTF-8