change to compile_assets_dev for install_assets

we already do compile_assets_dev for updating docker dev environments,
change the setup of docker to also run compile_assets_dev. Corrected
the echo to reflect what is now being ran.

flag = none

Test Plan:
-Jenkins passes
-Running docker_dev_setup or just install_assets inside docker container
 passes with no docs or styleguides

Change-Id: I2af28e29d587c9931be501b4a384f14b5c679418
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/260251
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Aaron Ogata <aogata@instructure.com>
QA-Review: James Butters <jbutters@instructure.com>
Product-Review: James Butters <jbutters@instructure.com>

script/install_assets.sh

@@ -18,8 +18,8 @@ function yarn_install() {
 }
 
 function compile_assets() {
-  echo "Running compile assets..."
-  COMPILE_ASSETS_NPM_INSTALL=0 bundle exec rails canvas:compile_assets
+  echo "Running compile assets dev (css and js only, no docs or styleguide)..."
+  bundle exec rails canvas:compile_assets_dev
 }
 
 ALL_COMMANDS='y'