feat: run goreleaser directly in CI after tagging

Removes separate release workflow since GITHUB_TOKEN can't trigger
other workflows. CI now handles test → tag → release in one job.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: brtkwr

.github/workflows/ci.yaml

@@ -8,7 +8,7 @@ jobs:
   test:
     uses: ./.github/workflows/test.yaml
 
-  tag:
+  release:
     needs: test
     runs-on: ubuntu-latest
     permissions:
@@ -19,7 +19,22 @@ jobs:
           fetch-depth: 0
 
       - name: Bump version and push tag
+        id: tag
         uses: mathieudutour/github-tag-action@v6.2
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           default_bump: patch
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.21"
+
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          version: "~> v2"
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          HOMEBREW_TAP_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}
+          GORELEASER_CURRENT_TAG: ${{ steps.tag.outputs.new_tag }}