Replicate cache-control for av-embeds routes

[amoore108]

Resolves JIRA https://jira.dev.bbc.co.uk/browse/WSTEAM1-1237

Overall changes

• Replicates the cache-control header from Morph for Syndication and non-Syndication routes

Testing

1. List the steps used to test this PR.

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[Isabella-Mitchell]

Looks good. I tried to test locally but I didn't see the expected results. However I'm not sure whether this is the right place, or we would expect to see this locally.

(I compared cache control of the document in the network tab for a live Morph asset and a local asset whilst running this branch).

[amoore108]

Looks good. I tried to test locally but I didn't see the expected results. However I'm not sure whether this is the right place, or we would expect to see this locally.

(I compared cache control of the document in the network tab for a live Morph asset and a local asset whilst running this branch).

Yea Next.js overrides the cache-control header when running locally/development mode so that hot-reloading / code change works correctly.

Think it sets it to something like no-cache or similar. It should change if you build the app in production mode and use yarn start.

[Isabella-Mitchell]

app in production mode and use yarn start.

Nice, yep that worked! Will note that one down for next time 🙌