feat: Add subscriptions to campaigns #33

Job	Run time
codeql / Analyze (javascript)	1m 13s
docker-build / Build Docker image	39s
warmup-cache / warmup-cache	27s
linting / check-linting	30s
translations / check-translations	29s
coverage / coverage-test	22s
build / build	23s
types / check-types	24s
formatter / check-format	26s
	4m 53s

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