adding PACKAGE_VERSION via an env file

.github/workflows/build.yml

@@ -37,6 +37,11 @@ jobs:
         with:
           node-version: '10.x'
 
+      - name: Set PACKAGE_VERSION
+        run: |
+          $env:pkgVersion = (Get-Content -Raw -Path .\package.json | ConvertFrom-Json).version
+          echo "{PACKAGE_VERSION}={$env:pkgVersion}" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+
       - name: Install
         run: npm install