ci-cd

Email subscription improvements #167

Job	Run time
Rubocop checking	49s
Ruby on Rails tests (3.2, test)	2m 14s
TypeScript type checking	32s
Ruby on Rails tests (3.1, test:system)	2m 10s
Ruby on Rails tests (3.2, test:system)	2m 35s
Ruby on Rails tests (3.1, test)	2m 25s
Dev server deployment	0s
Rubocop checking	49s
Ruby on Rails tests (3.1, test:system)	2m 11s
Ruby on Rails tests (3.2, test)	3m 53s
Ruby on Rails tests (3.2, test:system)	1m 58s
Ruby on Rails tests (3.1, test)	3m 59s
TypeScript type checking	32s
Dev server deployment	0s
	24m 7s

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