refactor gh actions (#614)

* refactor gh actions

* ci syntax fix

* add cache; fix upload docs

* add script; add build step

* add caching; enable xvfb

* add in xvfb

* remove non utf char

* add pdf section

* add pdf step

* allow latex failure

* style fix and extra import

* give documentation version

* disable layer caching

Author: akaszynski

.ci/azure-pipelines.yml

@@ -0,0 +1,6 @@
+#!/bin/bash
+echo $GH_PAT | docker login -u $GH_USERNAME --password-stdin docker.pkg.github.com
+docker pull $MAPDL_IMAGE
+docker run -e ANSYSLMD_LICENSE_FILE=1055@$LICENSE_SERVER --restart always --name mapdl -p $PYMAPDL_PORT:50052 $MAPDL_IMAGE -smp > log.txt &
+grep -q 'Server listening on' <(timeout 60 tail -f log.txt)
+python -c "from ansys.mapdl.core import launch_mapdl; print(launch_mapdl())"