Address publish workflow review feedback (#3)

Author: jozefizso

.github/workflows/publish.yml

@@ -13,6 +13,7 @@ permissions:
 jobs:
   publish:
     name: publish to npmjs
+    if: github.event.release.prerelease == false
     runs-on: ubuntu-latest
 
     steps:
@@ -44,7 +45,22 @@ jobs:
       - name: verify runtime dependency tree
         run: npm ls --omit=dev --all
 
+      - name: check npm package version
+        id: npm_version
+        run: |
+          package_name="$(node -p "require('./package.json').name")"
+          package_version="$(node -p "require('./package.json').version")"
+
+          if npm view "${package_name}@${package_version}" version --json >/dev/null 2>&1; then
+            echo "exists=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "exists=false" >> "$GITHUB_OUTPUT"
+          fi
+
+          echo "package=${package_name}@${package_version}" >> "$GITHUB_OUTPUT"
+
       - name: pack package
+        if: steps.npm_version.outputs.exists == 'false'
         id: pack
         run: |
           mkdir -p dist
@@ -54,18 +70,21 @@ jobs:
           echo "tarball=$tarball" >> "$GITHUB_OUTPUT"
 
       - name: attest npm package artifact
+        if: steps.npm_version.outputs.exists == 'false'
         uses: actions/attest@v4
         with:
           subject-path: ${{ steps.pack.outputs.tarball }}
 
       - name: upload npm package artifact
+        if: steps.npm_version.outputs.exists == 'false'
         uses: actions/upload-artifact@v4
         with:
           name: npm-package
           path: ${{ steps.pack.outputs.tarball }}
           if-no-files-found: error
 
       - name: publish package
+        if: steps.npm_version.outputs.exists == 'false'
         run: npm publish "$TARBALL" --provenance --access public
         env:
           TARBALL: ${{ steps.pack.outputs.tarball }}