fix - Fixed docker push

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Subject name needs to be filled, but it looks like that the workflow doesn't fill it up.

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Type: fix
Breaking: False
Doc Required: False
Backport Required: False
Part: 1/1

Author: AptiviCEO

.github/workflows/pushdocker.yml

@@ -39,6 +39,6 @@ jobs:
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1
         with:
-          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
+          subject-name: eofla/nitrocid
           subject-digest: ${{ steps.push.outputs.digest }}
           push-to-registry: true