Run pgdog configcheck in CI

[niclaflamme]

Goal

• The idea is to prevent us from uploading illegal pgdog.toml and users.toml snippets.
• Add configs test #5

Todo

• Add a .github actions

Known issue

• Extraneous names do not cause configs to fail.
• The extra fields are ignores,
• The misspelled field default to it's default.
• Below is a valid config snippet.
• This should be fixed in the main repo, not this repo, obv.
• The docker image is tied to a specific sha because main is currently cached?

[admin_badass]
password = "hunter2"

• In other words, if the goal is to prevent users from copying our typos and getting results they don't expect, these tests don't check for extra property typos.

[cloudflare-workers-and-pages]

Deploying pgdog-docs with    Cloudflare Pages

Latest commit:	56ae371
Status:	✅  Deploy successful!
Preview URL:	https://aac3a11c.pgdog-docs.pages.dev
Branch Preview URL:	https://nic-configcheck.pgdog-docs.pages.dev

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[niclaflamme]

fixed issue with users.toml overriding failed pgdog configs.
pgdogdev/pgdog#303

[niclaflamme]

it's ran as a script instead as part of a unit test suite.
could be revisited later if we feel the need to run tests as a blob tests/**/*.test.ts or something.

[levkk]

lgtm!