feat: Add subscriptions to campaigns #14

Job	Run time
codeql / Analyze (javascript)	1m 16s
warmup-cache / warmup-cache	26s
docker-build / Build Docker image	59s
types / check-types	31s
build / build	43s
coverage / coverage-test	58s
linting / check-linting	27s
formatter / check-format	29s
translations / check-translations	25s
	6m 14s

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