(DOCKER) allows to use jbarlow83's official docker image of OCRmyPDF, i.e. use a newer version

- if `/var/run/docker.sock` is found in the docker-container, this feature is activated - if not, nothing changes
 - usage: mount bind `docker.sock` from host by using `-v` or `volumes:`

docker/joex-entrypoint.sh

@@ -3,4 +3,15 @@
 echo "Starting unoconv listener"
 unoconv -l &
 
+# replace own ocrmypdf with official dockerfile, i.e. newer version
+if [ -S "/var/run/docker.sock" ]; then
+  echo "Found 'docker.sock': Installing Docker and redirecting 'ocrmypdf' command to official dockerfile by jbarlow83"
+  apk --no-cache add docker
+  docker pull jbarlow83/ocrmypdf
+  function ocrmypdf () {
+    docker run jbarlow83/ocrmypdf $@
+  }
+  echo "Using OCRmyPDF v$(ocrmypdf --version)" && echo
+fi
+
 /opt/docspell-joex/bin/docspell-joex "$@"