Add automatic npm publishing to release workflow

After building binaries and creating the GitHub Release, the workflow
now also publishes the npm package (unrealcli) automatically. Version
is extracted from the git tag. Requires NPM_TOKEN secret on the repo.

Author: aadeshrao123

.github/workflows/release.yml

@@ -94,3 +94,29 @@ jobs:
             binaries/ue-cli-linux-arm64
             binaries/ue-cli-darwin-amd64
             binaries/ue-cli-darwin-arm64
+
+  publish-npm:
+    needs: release
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Update npm package version from tag
+        working-directory: cli/npm
+        run: |
+          VERSION="${GITHUB_REF_NAME#v}"
+          npm version "$VERSION" --no-git-tag-version --allow-same-version
+
+      - name: Publish to npm
+        working-directory: cli/npm
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: npm publish --access public