sergey-safarov left a comment (kamailio/kamailio#4241)

build_and_install - build Kamailio sources, package, and install
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L12C1-L21

list_installed_kamailio_packages - list installed packages and filter by kamailio string. This output installed the kamailio packages.
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L27-L36

kamailio_files() - list the content of the kamailio packages and some mandatory packages.
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L27-L36

extra_files() - list of mandatory files for Alpine-based Kamailio docker image.
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L38-L58

sort_filelist—after merging the ldd output, some files may be listed several times. function make filelist deduplication
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L60-L63

filter_unnecessary_files() - exclude debug, man, docs and redme files from packaging into the docker image
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L65-L78

ldd_helper() - functions to call ldd and parse output. For Kamailio modules required preload Kamailio binary file.
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L80C1-L85

find_binaries - we package binary files only. ldd is used to test file is binary or not. This function also dynamically linked files
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L87C1-L103

filter_os_files - exclude files present in the base Alpine Docker image. Required to avoid unnecessary file copy to the layer.
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L87C1-L103

tar_files - create two tar archives. First contains all the files required for minimal Docker images. The second tar archive contains files required to add to the base Alpine image.
Probably here kamailio binary files are listed twice in the $TARLIST.
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L118-L133

make_image_tar - create a minimal image tree and add busybox to the tree. After this package tar again
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L135-L141

create_apk_dir - copy the kamailio packages to the mounted folder. These files will be present on the host when docker container is terminated
https://github.com/kamailio/kamailio-ci/blob/master/alpine/build.sh#L143-L145

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