feat: auto-tag on version bump

.github/workflows/auto-tag.yml

@@ -0,0 +1,48 @@
+name: Auto-tag on version bump
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "package.json"
+
+permissions:
+  contents: write
+
+jobs:
+  tag:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+
+      - name: Check if version changed
+        id: version
+        run: |
+          current=$(python3 -c 'import json;print(json.load(open("package.json"))["version"])')
+          previous=$(git show HEAD~1:package.json 2>/dev/null | python3 -c 'import json,sys;print(json.load(sys.stdin)["version"])' 2>/dev/null || echo "")
+
+          echo "current=$current" >> "$GITHUB_OUTPUT"
+          echo "previous=$previous" >> "$GITHUB_OUTPUT"
+
+          if [ "$current" != "$previous" ] && [ -n "$current" ]; then
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Create and push tag
+        if: steps.version.outputs.changed == 'true'
+        env:
+          VERSION: ${{ steps.version.outputs.current }}
+        run: |
+          tag="v${VERSION}"
+          if git ls-remote --exit-code --tags origin "refs/tags/$tag" >/dev/null 2>&1; then
+            echo "Tag $tag already exists, skipping"
+            exit 0
+          fi
+          git tag "$tag"
+          git push origin "$tag"
+          echo "Created and pushed tag $tag"