ci: add reusable cloudflare deploy

[rndquu]

Resolves ubiquity/cloudflare-deploy-action#1 (comment)

How it works:

1. On pull_request or push the build workflow is called (which uploads build to github artifacts)
2. When build is finished then deploy to cloudflare workflow is called (in privileged context, i.e. with access to organization secrets)
3. Reusable cloudflare workflow is called
4. Resuable cloudflare deploy action is called

[github-actions]

Lines	Statements	Branches	Functions
	80% (4/5)	100% (0/0)	66.66% (2/3)

JUnit

Tests	Skipped	Failures	Errors	Time
1	0 💤	0 ❌	0 🔥	2.759s ⏱️

Coverage Report (80%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	80	100	66.66	80
main.ts	80	100	66.66	80	9

[ubiquity-os-deployer]

84d03ca