Merge branch 'doc-environment' into 'staging'

[ci] create a readthedocs environment

See merge request !90
11 jobs for staging in 7 minutes and 20 seconds (queued for 1 second)
Status Job ID Name Coverage
  Style
passed #46572
integration
checkpatch

00:00:56

passed #46609
integration
repoquality

00:00:11

passed #46573
integration
style:docs

00:01:24

failed #46571
integration
repoquality

00:30:00

failed #46578
integration
repoquality

00:30:00

failed #46608
integration
repoquality

00:27:29

 
  Build
passed #46574
make:generic

00:01:34

passed #46576
knl
make:knl

00:02:27

passed #46575
make:out-of-tree

00:01:34

 
  Docs
passed #46611
integration
readthedocs

00:00:05

passed #46577
integration
readthedocs

00:00:05