Added Polymer requirements to environment_enpt.yml and adapted enpt_ci.docker...

Added Polymer requirements to environment_enpt.yml and adapted enpt_ci.docker to use this for CI (contains all dev requirements).

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
6 jobs for feature/separate_ac_land_water in 12 minutes and 50 seconds
Status Job ID Name Coverage
  Test
passed #65281
test_enpt

00:10:52

91.0%
passed #65282
test_styles

00:00:41

passed #65283
test_urls

00:01:16

canceled #65278
test_enpt

00:01:11

canceled #65279
test_styles

canceled #65280
test_urls