The ETag is messed up again for /assets urls

[Kale-Ko]

Describe the bug
When fetching /assets urls they will sometimes return no ETag and sometimes will return two ETags, one of which is invalid.

When two ETags are returned they look like this (as output by curl and FireFox)

To Reproduce
Curl the following urls and observe the described behavior.

Details

curl "https://staging-api.adoptium.net/v3/assets/latest/21/hotspot?os=linux&architecture=x64&image_type=jdk" -v -o /dev/null - No ETag
curl "https://staging-api.adoptium.net/v3/assets/latest/21/hotspot?os=linux&architecture=x64&image_type=jdk" --compressed -v -o /dev/null` - Correct response
curl "https://staging-api.adoptium.net/v3/assets/latest/21/hotspot?os=linux&architecture=x64&image_type=jdk" -H "If-None-Match: 431fcb363e7ba7c72954d7590cea42ac70bd996b" -v -o /dev/null` - Two ETags
curl "https://staging-api.adoptium.net/v3/assets/latest/21/hotspot?os=linux&architecture=x64&image_type=jdk" -H "If-None-Match: 431fcb363e7ba7c72954d7590cea42ac70bd996b" --compressed -v -o /dev/null` - Two ETags
curl "https://staging-api.adoptium.net/v3/assets/latest/21/hotspot?os=linux&architecture=x64&image_type=jdk" -H "If-Match: anything" -v -o /dev/null` - Two ETags
curl "https://staging-api.adoptium.net/v3/assets/latest/21/hotspot?os=linux&architecture=x64&image_type=jdk" -H "If-Match: anything" --compressed -v -o /dev/null` - Two ETags

Expected behavior
There should always be exactly one ETag returned.

Device (please complete the following information):

• OS:Linux
• Browser curl, FireFox
• Version 8.12.1, 136.0

Additional context
This is currently causing problems in a Docker build when the cache is used