docs: typo fix Update publish-image.sh (#2453)

## Why is this change needed?

The word "permissions" is used in plural form. However, it would be more
accurate to use "**permission**" in singular, as it typically refers to
general access rather than multiple specific rights in this context.

## Merge Checklist

- [ ] PR title adheres to the [conventional
commits](https://www.conventionalcommits.org/en/v1.0.0/) standard
- [ ] PR has a
[changeset](https://github.com/farcasterxyz/hub-monorepo/blob/main/CONTRIBUTING.md#35-adding-changesets)
- [ ] PR has been tagged with a change label(s) (i.e. documentation,
feature, bugfix, or chore)
- [x] PR includes
[documentation](https://github.com/farcasterxyz/hub-monorepo/blob/main/CONTRIBUTING.md#32-writing-docs)
if necessary.


<!-- start pr-codex -->

---

## PR-Codex overview
This PR focuses on correcting the grammatical error in the comments of
the `scripts/publish-image.sh` file regarding permissions for Docker
login.

### Detailed summary
- Changed "necessary permissions" to "necessary permission" in the
comment about Docker login.

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your
question}`

<!-- end pr-codex -->

scripts/publish-image.sh

@@ -5,7 +5,7 @@
 #
 # MUST be run from the root of the repository so the Docker build context is correct.
 #
-# You must `docker login ...` first so that we have the necessary permissions to
+# You must `docker login ...` first so that we have the necessary permission to
 # push the image layers + tags to Docker Hub.
 
 HUBBLE_VERSION=$(node -e "console.log(require('./apps/hubble/package.json').version);")