add a how-to for self-hosted edge functions

[everettbu]

Mirror of supabase/supabase#43177
Original author: aantti

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I have read the CONTRIBUTING.md file.

YES

What kind of change does this PR introduce?

• Add a new how-to covering the basics of self-hosted edge functions
• Add SUPABASE_PUBLIC_URL to docker-compose.yml

[github-actions]

🎭 Playwright Test Results

 144 passed
 1 flaky
 5 skipped

Details

 150 tests across 20 suites
 8 minutes, 23 seconds
 69b6099

Flaky tests

Features › cron-jobs.spec.ts › Cron Jobs Integration › Cron Jobs CRUD Operations › can view cron jobs page

Skipped tests

Features › assistant.spec.ts › AI Assistant › Can send a message to the assistant and receive a response
Features › sql-editor.spec.ts › SQL Editor › snippet favourite works as expected
Features › sql-editor.spec.ts › SQL Editor › share with team works as expected
Features › sql-editor.spec.ts › SQL Editor › folders works as expected
Features › sql-editor.spec.ts › SQL Editor › other SQL snippets actions work as expected

[everettbu]

Upstream PR was closed or merged. Code is synced via branch mirror.