Add workflow to publish to Sigrid #75

Job	Run time
Frontend	1m 29s
Backend (ubuntu-latest)	2m 17s
Playwright UI tests (ubuntu-latest)	1m 36s
Backend (windows-latest)	4m 33s
Playwright UI tests (windows-latest)	3m 34s
Backend (macos-latest)	1m 50s
Playwright UI tests (macos-latest)	3m 2s
Deploy to abacus-test.nl	4s
Playwright d2d tests (ubuntu-latest, 1/3)	2m 28s
Playwright d2d tests (ubuntu-latest, 2/3)	1m 53s
Playwright d2d tests (ubuntu-latest, 3/3)	1m 53s
Playwright d2d tests (windows-latest, 1/3)	3m 7s
Playwright d2d tests (windows-latest, 2/3)	4m 28s
Playwright d2d tests (windows-latest, 3/3)	5m 13s
Playwright d2d tests (macos-latest, 1/3)	1m 52s
Playwright d2d tests (macos-latest, 2/3)	1m 18s
Playwright d2d tests (macos-latest, 3/3)	1m 33s
	42m 10s

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