feat(cloudflare-tunnel-remote): add external secrets support

[hedgieinsocks]

PR https://github.com/cloudflare/helm-charts/pull/38 has introduced external secrets support for the main cloudflare-tunnel chart.

As per the listed below links, the community does need this feature to be ported to cloudflare-tunnel-remote chart as well.

https://github.com/cloudflare/helm-charts/issues/36 https://github.com/cloudflare/helm-charts/issues/60 https://github.com/cloudflare/helm-charts/pull/63

This PR is a desperate attempt to push this forward by making minimal changes to ease the review by the maintainers.

[hedgieinsocks]

Hello, tagged you obezuk as the approver for the similar pr https://github.com/cloudflare/helm-charts/pull/38 in hope to get this one noticed.

[Sea-you]

Dear ppl of @Cloudflare, would it be possible to review and merge this PR?

[mergwyn]

is there anything the community can do to enable this PR to be merged?

[jackylamhk]

I was about to open a PR for the same thing, leaving this comment for visibility.

[dudo]

@obezuk Do you think you could take a look at this? I'd rather not have to fork this. There aren't that many issues / PRs to maintain here...

[dudo]

I created my own chart... took less than an hour after starting with helm create.

https://github.com/dudo-home-lab/helm-charts/tree/main/charts/cloudflare-tunnel-remote

Not ideal, as I don't love this type fracturing, but this is a very lightweight wrapper around cloudflared ultimately. If @cloudflare isn't going to maintain these charts, I'd rather see them archived, honestly.