Keep the version number as step output

Author: suricactus

.github/workflows/deploy_to_pypi.yml

@@ -17,8 +17,10 @@ jobs:
 
     - name: Get version number
       id: v
-      run: >-
-        echo "${GITHUB_REF/refs\/tags\/v}" > VERSION
+      run: |
+        export VERSION_NUMBER=${GITHUB_REF/refs\/tags\/v}
+        echo $VERSION_NUMBER > VERSION
+        echo "::set-output name=VERSION::${VERSION_NUMBER}"
 
     - name: Install pypa/build
       run: >-