Updates to Dockerfile:
Updates to Dockerfile:

- Build frontend assets (needed for standalone use of the image).
- Change ownership of the files to redash user.

denisov-vlad/redash,imsally/redash,vishesh92/redash,useabode/redash,imsally/redash,alexanderlz/redash,crowdworks/redash,crowdworks/redash,EverlyWell/redash,M32Media/redash,alexanderlz/redash,M32Media/redash,amino-data/redash,getredash/redash,amino-data/redash,rockwotj/redash,EverlyWell/redash,amino-data/redash,getredash/redash,moritz9/redash,useabode/redash,44px/redash,moritz9/redash,alexanderlz/redash,44px/redash,alexanderlz/redash,denisov-vlad/redash,denisov-vlad/redash,imsally/redash,crowdworks/redash,moritz9/redash,hudl/redash,chriszs/redash,denisov-vlad/redash,M32Media/redash,vishesh92/redash,rockwotj/redash,crowdworks/redash,imsally/redash,hudl/redash,rockwotj/redash,vishesh92/redash,useabode/redash,moritz9/redash,chriszs/redash,44px/redash,chriszs/redash,denisov-vlad/redash,EverlyWell/redash,getredash/redash,vishesh92/redash,M32Media/redash,useabode/redash,hudl/redash,hudl/redash,chriszs/redash,rockwotj/redash,getredash/redash,getredash/redash,EverlyWell/redash,amino-data/redash,44px/redash