Update GitHub Actions workflows for Sonatype Central migration

- Fix secret names to use SONATYPE_USERNAME and SONATYPE_PASSWORD
- Remove deprecated sonatypeBundleRelease command from release workflow
- Consolidate release steps to use publishSigned with correct environment
- Update both release.yml and snapshot.yml workflows

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: xerial

.github/workflows/release.yml

@@ -26,13 +26,9 @@ jobs:
         env:
           PGP_SECRET: ${{ secrets.PGP_SECRET }}
         run: echo $PGP_SECRET | base64 --decode | gpg --import --batch --yes
-      - name: Build bundle
-        env:
-          PGP_PASSPHRASE: ${{ secrets.PGP_PASSPHRASE }}
-        run: |
-          ./sbt publishSigned
       - name: Release to Sonatype
         env:
-          SONATYPE_USERNAME: '${{ secrets.SONATYPE_USER }}'
-          SONATYPE_PASSWORD: '${{ secrets.SONATYPE_PASS }}'
-        run: ./sbt sonatypeBundleRelease
+          PGP_PASSPHRASE: ${{ secrets.PGP_PASSPHRASE }}
+          SONATYPE_USERNAME: '${{ secrets.SONATYPE_USERNAME }}'
+          SONATYPE_PASSWORD: '${{ secrets.SONATYPE_PASSWORD }}'
+        run: ./sbt publishSigned

.github/workflows/snapshot.yml

@@ -27,6 +27,6 @@ jobs:
           distribution: adopt
       - name: Publish snapshots
         env:
-          SONATYPE_USERNAME: '${{ secrets.SONATYPE_USER }}'
-          SONATYPE_PASSWORD: '${{ secrets.SONATYPE_PASS }}'
+          SONATYPE_USERNAME: '${{ secrets.SONATYPE_USERNAME }}'
+          SONATYPE_PASSWORD: '${{ secrets.SONATYPE_PASSWORD }}'
         run: ./sbt publish