test: use worker env for passing mock app url

[TheUnderScorer]

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[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	100%	304/304
🟢	Branches	97.92%	47/48
🟢	Functions	100%	79/79
🟢	Lines	100%	289/289

Test suite run success

175 tests passing in 12 suites.

Report generated by 🧪jest coverage report action from b18e115

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St	File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
🟢	All files	100	97.91	100	100
🟢	src	100	100	100	100
🟢	config.ts	100	100	100	100
🟢	env.ts	100	100	100	100
🟢	handler.ts	100	100	100	100
🟢	index.ts	100	100	100	100
🟢	src/handlers	100	92.85	100	100
🟢	handleDownloadScript.ts	100	100	100	100
🟢	handleIngressAPI.ts	100	80	100	100	20
🟢	handleStatusPage.ts	100	100	100	100
🟢	index.ts	100	100	100	100
🟢	src/utils	100	100	100	100
🟢	addProxyIntegrationHeaders.ts	100	100	100	100
🟢	addTrafficMonitoring.ts	100	100	100	100
🟢	cookie.ts	100	100	100	100
🟢	createErrorResponse.ts	100	100	100	100
🟢	createResponseWithMaxAge.ts	100	100	100	100
🟢	fetchCacheable.ts	100	100	100	100
🟢	getCacheControlHeaderWithMaxAgeIfLower.ts	100	100	100	100
🟢	index.ts	100	100	100	100
🟢	proxyEndpoint.ts	100	100	100	100
🟢	returnHttpResponse.ts	100	100	100	100
🟢	routing.ts	100	100	100	100

[github-actions]

This PR will create a minor release 🚀

1.6.0 (2024-05-24)

Features

• remove hard-coded proxy endpoints, introduce config in build (f5e91c2)

Performance Improvements

• updated Cloudflare worker runtime compabilitiy date (07eaaba)