debian: Create local apt repo after build

Provide local APR repository as part of the result in the distribution's
build result folder and prepare this folder as a local APT repository for
easy install on a target system.

Tracked-On: #6688
Signed-off-by: Helmut Buchsbaum <helmut.buchsbaum@opensource.tttech-industrial.com>

debian/docker/create-apt-repo.sh

@@ -0,0 +1,31 @@
+#!/bin/bash -e
+
+# helper to create local APT repository includeing all package available in
+# the docker images's local apt repo
+
+if [ $# -ne 1 ]; then
+   echo "Call with: $(basename ${BASH_SOURCE[0]}) <path to local apt directory>" >&2
+   exit 1
+fi
+
+if [ ! -d $1 ]; then
+   echo "Please create target directory $1 before calling this script!" >&2
+   exit 1
+fi
+
+if [[ -n ${UID} && -n ${GID} ]]; then
+    addgroup --gid ${GID} docker-build
+    adduser --uid=${UID} --gid=${GID} --disabled-password --gecos '' docker-build
+else
+    echo "UID/GID not set. Use docker run -e UID=$(id -u) -e GID=$(id -g)" >&2
+    exit 1
+fi
+
+# copy all Debian packages in local APT repo and create local APT repository
+export HOME=$(echo ~docker-build)
+sudo -E -u docker-build /bin/bash -c "\
+    cd $1 && cp /opt/apt/*.deb . && \
+    apt-ftparchive packages . > Packages && \
+    cp /opt/apt/.Release.header Release && \
+    apt-ftparchive release . >> Release"
+