Remove redundant prerelease job from release workflow

The publish-prerelease job created a race condition with
publish-release when merging Version Packages PRs, causing both
jobs to attempt publishing the same version simultaneously (409
Conflict from npm). PR previews already handle preview builds,
making the prerelease job unnecessary.

Author: ghostwriternr

.github/workflows/release.yml

@@ -71,81 +71,6 @@ jobs:
       - name: Run container unit tests
         run: npm run test -w @repo/sandbox-container
 
-  # Prerelease publish - always runs after tests pass
-  publish-prerelease:
-    needs: [unit-tests]
-    if: ${{ github.repository_owner == 'cloudflare' }}
-    runs-on: ubuntu-latest
-    timeout-minutes: 30
-    permissions:
-      contents: read
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-node@v4
-        with:
-          node-version: 24
-          cache: 'npm'
-
-      - uses: oven-sh/setup-bun@v2
-        with:
-          bun-version: latest
-
-      - name: Install dependencies
-        run: npm ci
-
-      - name: Build packages
-        run: npm run build
-
-      - name: Modify package.json version
-        run: npx tsx .github/version-script.ts
-
-      - name: Resolve workspace dependencies
-        run: npx tsx .github/resolve-workspace-versions.ts
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Login to Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKER_HUB_USERNAME }}
-          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
-
-      - name: Build and cache single-arch image (for PR cache reuse)
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: packages/sandbox/Dockerfile
-          platforms: linux/amd64
-          push: false # Don't push, just cache
-          cache-from: type=gha,scope=release-amd64
-          cache-to: type=gha,mode=max,scope=release-amd64
-          build-args: |
-            SANDBOX_VERSION=${{ needs.unit-tests.outputs.version }}
-
-      - name: Build and push Docker image (beta)
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: packages/sandbox/Dockerfile
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: cloudflare/sandbox:${{ needs.unit-tests.outputs.version }}-beta
-          cache-from: |
-            type=gha,scope=release-amd64
-            type=gha,scope=release
-          cache-to: type=gha,mode=max,scope=release
-          build-args: |
-            SANDBOX_VERSION=${{ needs.unit-tests.outputs.version }}
-
-      - name: Publish to npm with beta tag
-        run: npm publish --tag beta --access public
-        env:
-          NPM_PUBLISH_TOKEN: ${{ secrets.NPM_PUBLISH_TOKEN }}
-        working-directory: packages/sandbox
-
   # Release publish - only runs if changesets exist
   publish-release:
     needs: [unit-tests]