github: publish signing keys (#524)

Publish singing key to the public key signing servers for ease of
verification via Web-of-trust.

Author: xnox

.github/workflows/release.yml

@@ -43,7 +43,7 @@ jobs:
           gpg_private_key: ${{ steps.secrets.outputs.token }}
 
       - run: |
-          gpg --export --armor ${{ steps.import_gpg.outputs.fingerprint }}
+          gpg --keyserver keys.openpgp.org --send-keys ${{ steps.import_gpg.outputs.fingerprint }}
 
       - uses: goreleaser/goreleaser-action@9c156ee8a17a598857849441385a2041ef570552 # v6.3.0
         with: