ci: use explicit name when publishing s3 blobs

[takirala]

What problem does this PR solve?:

Follow up of #2710

Above change corrupted how we publish artifacts cuz i see:

 ❯ curl -L https://downloads.d2iq.com/dkp/v2.13.0-dev.2 --output local.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  449k  100  449k    0     0  1414k      0 --:--:-- --:--:-- --:--:-- 1413k
 ❯ tar -tvf local.tar.gz
drwxr-xr-x runner/runner     0 2024-10-14 18:30 ./
drwxr-xr-x runner/runner     0 2024-10-14 18:29 ./charts/
drwxr-xr-x runner/runner     0 2024-10-14 18:29 ./charts/kommander-operator/
-rw-r--r-- runner/runner   168 2024-10-14 18:29 ./charts/kommander-operator/Chart.yaml

Which issue(s) does this PR fix?:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Checklist

• If the PR adds a version bump, ensure there is no breaking change in Licensing model (or NA).
• If a chart is changed or app configuration is significantly changed, the chart version is correctly incremented (so that apps are not automatically upgraded from a previous version of DKP).

[coveralls]

Pull Request Test Coverage Report for Build 11353848515

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 51.703%

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Totals
Change from base Build 11353130009:	0.0%
Covered Lines:	167
Relevant Lines:	323

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💛 - Coveralls

[gracedo]

maybe we can test it by tagging this as v2.13.0-dev