Dockerfile: Switch to python:3.7-alpine image
Dockerfile: Switch to python:3.7-alpine image

puppet-community/puppetboard,johnzimm/xx-puppetboard,puppet-community/puppetboard,johnzimm/xx-puppetboard,voxpupuli/puppetboard,johnzimm/puppetboard,johnzimm/xx-puppetboard,grandich/puppetboard,johnzimm/puppetboard,grandich/puppetboard,voxpupuli/puppetboard,grandich/puppetboard,puppet-community/puppetboard,voxpupuli/puppetboard,johnzimm/xx-puppetboard,grandich/puppetboard,johnzimm/puppetboard