feat: Add subscriptions to campaigns #24

Job	Run time
docker-build / Build Docker image	58s
codeql / Analyze (javascript)	1m 16s
warmup-cache / warmup-cache	24s
build / build	44s
linting / check-linting	29s
translations / check-translations	29s
types / check-types	33s
coverage / coverage-test	56s
formatter / check-format	27s
	6m 16s

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