Fix build

Author: tvdijen

.github/workflows/php.yml

@@ -148,8 +148,8 @@ jobs:
 
       - name: Get COMPOSER_ROOT_VERSION from composer.json branch alias
         run: |
-            echo ROOT_VERSION="$(composer config extra.branch-alias.dev-master)" >> "$env:ROOT_VERSION"
-            if [ -z "${{ ROOT_VERSION }}" ]; then
+            echo ROOT_VERSION="$(composer config extra.branch-alias.dev-master)" >> "$env:GITHUB_ENV"
+            if [ -z "${{ env.ROOT_VERSION }}" ]; then
               echo "Could not read extra.branch-alias.dev-master from composer.json" >&2
               exit 1
             fi