Add Debian Bullseye

bullseye/x86/Dockerfile

+FROM i386/debian:bullseye
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+ && apt-get upgrade -y
+
+RUN apt-get install -y \
+  sudo wget curl tar expect git \
+  devscripts build-essential lintian ccache pbuilder aptitude apt-utils
+
+RUN echo "deb http://deb.debian.org/debian bullseye-backports main" >/etc/apt/sources.list.d/backports.list
+
+RUN curl https://packages.icinga.com/icinga.key | apt-key add - \
+ && DIST=$(awk -F"[)(]+" '/VERSION=/ {print $2}' /etc/os-release) \
+ && DIST=bullseye \
+ && echo "deb http://packages.icinga.com/debian icinga-${DIST} main" > /etc/apt/sources.list.d/${DIST}-icinga.list
+
+RUN groupadd -g 1000 build \
+ && useradd -u 1000 -g 1000 -m build \
+ && echo 'Defaults:build !requiretty' | tee -a /etc/sudoers \
+ && echo 'build ALL=(ALL:ALL) NOPASSWD: ALL' | tee -a /etc/sudoers \
+ && chown build.build /usr/local/bin
+
+USER build
+RUN git clone https://git.icinga.com/build-docker/scripts.git /usr/local/bin
+ENTRYPOINT ["/usr/local/bin/icinga-build-entrypoint"]
+CMD ["icinga-build-package"]