Fix build workflow publish-packages auth issue

Fixes the authentication error in the `publish-packages` job when
logging into GitHub Container Registry:

The `publish-packages` job fails with "Username and password
required" when attempting to login to ghcr.io. This happens because
the job tries to use `${{ env.GITHUB_ACTOR }}` and
`${{ env.GITHUB_TOKEN }}` environment variables that are never set.

Author: inancgumus

.github/workflows/build.yml

@@ -597,6 +597,9 @@ jobs:
           echo "${PGP_SIGN_KEY}" > packaging/sign-key.gpg
       - name: Login to GitHub Container Registry
         uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
+        env:
+          GITHUB_ACTOR: ${{ github.actor }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           registry: ghcr.io
           username: ${{ env.GITHUB_ACTOR }}