template(vite-cloudflare): Add _routes.json, _headers and .dev.vars to .gitignore

[lasseklovstad]

👋 Hey, after testing the vite cloudflare template and deployed it I found some minor issues. It took me maybe 2 hours to find out to set Cloudflare settings 'Build output directory' to 'build/client'. Other then that is went smooth.

• Added .dev.vars to .gitignore so you don't push your development env variables
• After looking at cloudflare-pages template I saw _routes.json and _headers files. Don't see why they shouldn't be added to mirror the template for cloudflare.

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[remix-cla-bot]

Hi @lasseklovstad,

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[arjunyel]

I verified with a Cloudflare support engineer on Discord that these values are correct https://discord.com/channels/595317990191398933/789155108529111069/1212105133228564490

[mw10013]

@lasseklovstad : Thank you for this. Seems to have fixed a production issue for me where assets were not being found. Much gratitude for your painstaking work in tracking this down.

[andrelandgraf]

I think you could also make the same change for the cloudflare-pages and cloudflare-workers templates.

[arjunyel]

Those templates won't be maintained anymore

[jwaltz]

Similar to @mw10013, I was having issues with asset requests returning 404 in production. This seems to have resolved the issue. Hope it gets merged soon. Thanks!