merged some RUN layers

docker.io/fphammerle/radicale@sha256:80214c678ae182838bc0af3f07ae0ff7…

…c2855afb39b61911ff4c21f1199605e4

ssh client

new features:
* added openssh client
* create ssh keypair on container startup
  (to be able to git pull/push in storage hook)

sha256:70b0f242509d0dda0abc9095d33c578944c47c51a4b7f04269aa756564b525d7

initial release

radicale from alpine/edge/testing + bcrypt dependencies

sha256:ba254d9d0c1edff3dec6e0307bd6d7d2a1c9edca27e5b5c9f256512c27cd863c