Merge branch '2-automated-builds' into 'master'

Automated image builds for registry

Closes #2, #3, and #1

See merge request !5
8 jobs for master in 26 minutes and 58 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #1713
lint_dockerfile

00:00:34

 
  Deploy
passed #1714
manual
build-golang-master

00:02:42

passed #1720
manual
build-php-5.3-master

00:04:01

passed #1719
manual
build-php-5.6-master

00:16:16

passed #1718
manual
build-php-7.0-master

00:04:44

passed #1717
manual
build-php-7.1-master

00:20:08

passed #1716
manual
build-php-7.2-master

00:05:37

passed #1715
manual
build-php-7.3-master

00:05:20