Build frontend and backend in Dockerfile (#1126) #2930

Job	Run time
Backend (ubuntu-latest)	3m 17s
Backend (macos-latest)	3m 26s
Backend (windows-latest)	5m 13s
Frontend	1m 51s
Playwright ladle tests (ubuntu-latest)	2m 9s
Playwright ladle tests (windows-latest)	3m 40s
Playwright ladle tests (macos-latest)	2m 25s
Deploy to abacus-test.nl	24s
Playwright e2e tests (ubuntu-latest)	5m 58s
Playwright e2e tests (windows-latest)	13m 39s
Playwright e2e tests (macos-latest)	5m 43s
	47m 45s

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