Update for v1.4.0, and fix Dockerfile
Update for v1.4.0, and fix Dockerfile

- In Dockerfile, move to Alpine 3.10, download Jobber package, change
jobberuser UID, and change 'CMD' so that it works with Jobber 1.4.

thresheek/official-images,docker-library/official-images,thresheek/official-images,neo-technology/docker-official-images,thresheek/official-images,infosiftr/stackbrew,31z4/official-images,docker-solr/official-images,jperrin/official-images,docker-flink/official-images,thresheek/official-images,infosiftr/stackbrew,docker-library/official-images,neo-technology/docker-official-images,infosiftr/stackbrew,dinogun/official-images,docker-library/official-images,docker-library/official-images,dinogun/official-images,docker-solr/official-images,docker-library/official-images,docker-solr/official-images,neo-technology/docker-official-images,jperrin/official-images,neo-technology/docker-official-images,docker-solr/official-images,dinogun/official-images,infosiftr/stackbrew,dinogun/official-images,31z4/official-images,thresheek/official-images,neo-technology/docker-official-images,jperrin/official-images,31z4/official-images,jperrin/official-images,docker-solr/official-images,dinogun/official-images,docker-flink/official-images,neo-technology/docker-official-images,31z4/official-images,docker-solr/official-images,jperrin/official-images,thresheek/official-images,docker-library/official-images,infosiftr/stackbrew,docker-library/official-images,dinogun/official-images,docker-library/official-images,docker-solr/official-images,thresheek/official-images,thresheek/official-images,neo-technology/docker-official-images,docker-flink/official-images,infosiftr/stackbrew,jperrin/official-images,31z4/official-images,docker-library/official-images,neo-technology/docker-official-images,docker-solr/official-images,infosiftr/stackbrew,infosiftr/stackbrew,thresheek/official-images,31z4/official-images,31z4/official-images,jperrin/official-images,dinogun/official-images,neo-technology/docker-official-images,docker-library/official-images,jperrin/official-images,infosiftr/stackbrew,jperrin/official-images,thresheek/official-images,neo-technology/docker-official-images,dinogun/official-images,docker-solr/official-images,infosiftr/stackbrew,neo-technology/docker-official-images,thresheek/official-images,neo-technology/docker-official-images,31z4/official-images,docker-solr/official-images,jperrin/official-images,dinogun/official-images,docker-library/official-images,docker-flink/official-images,docker-flink/official-images,docker-library/official-images,docker-library/official-images,docker-solr/official-images,dinogun/official-images,31z4/official-images,docker-flink/official-images,docker-flink/official-images,docker-solr/official-images,docker-flink/official-images,docker-flink/official-images,neo-technology/docker-official-images,thresheek/official-images,31z4/official-images,docker-flink/official-images,thresheek/official-images,jperrin/official-images,31z4/official-images,docker-flink/official-images,infosiftr/stackbrew,docker-flink/official-images,infosiftr/stackbrew,neo-technology/docker-official-images,jperrin/official-images,jperrin/official-images,thresheek/official-images,docker-flink/official-images,dinogun/official-images,31z4/official-images,infosiftr/stackbrew,31z4/official-images,docker-solr/official-images,docker-library/official-images,infosiftr/stackbrew,dinogun/official-images,dinogun/official-images,docker-solr/official-images,31z4/official-images