fix: combine auto-tag and release into one workflow

Tags pushed with GITHUB_TOKEN don't trigger other workflows, so the
separate release.yml never fired. Collapse both into a single workflow
that creates the tag then creates the release in the same run.

Author: stephen-kintsugi

.github/workflows/auto-tag.yml

@@ -1,4 +1,4 @@
-name: Auto Tag
+name: Auto Tag and Release
 
 on:
   push:
@@ -9,6 +9,9 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: write
+    outputs:
+      tag: ${{ steps.tag.outputs.tag }}
+      created: ${{ steps.tag.outputs.created }}
 
     steps:
       - name: Checkout code
@@ -17,18 +20,41 @@ jobs:
           fetch-depth: 0
 
       - name: Create tag if needed
+        id: tag
         run: |
           VERSION=$(grep '^version = ' pyproject.toml | sed 's/version = "\(.*\)"/\1/')
           TAG="v${VERSION}"
 
           echo "Detected version: $VERSION"
           echo "Tag: $TAG"
+          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
 
           if git rev-parse "$TAG" >/dev/null 2>&1; then
             echo "Tag $TAG already exists. Nothing to do."
+            echo "created=false" >> "$GITHUB_OUTPUT"
             exit 0
           fi
 
           echo "Creating and pushing tag $TAG"
           git tag "$TAG"
           git push origin "$TAG"
+          echo "created=true" >> "$GITHUB_OUTPUT"
+
+  release:
+    needs: auto-tag
+    if: needs.auto-tag.outputs.created == 'true'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Create GitHub Release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release create "${{ needs.auto-tag.outputs.tag }}" \
+            --title "Release ${{ needs.auto-tag.outputs.tag }}" \
+            --generate-notes