Merge branch 'add_gpl_license' into 'master'

Add GPL license

See merge request !75
3 jobs for develop in 1 minute and 19 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Test
passed #28025
ruby postgres
test

00:01:08

 
  Build
passed #28026
docker build
build

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  Deploy
passed #28027
docker build
deploy

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