Fix build

Author: tvdijen

.github/workflows/php.yml

@@ -148,12 +148,12 @@ jobs:
 
       - name: Get COMPOSER_ROOT_VERSION from composer.json branch alias
         run: |
-            ROOT_VERSION=$(composer config extra.branch-alias.dev-master)
-            if [ -z "$ROOT_VERSION" ]; then
+            echo ROOT_VERSION="$(composer config extra.branch-alias.dev-master)" >> "$env:ROOT_VERSION"
+            if [ -z "${{ env.ROOT_VERSION }}" ]; then
               echo "Could not read extra.branch-alias.dev-master from composer.json" >&2
               exit 1
             fi
-            echo "COMPOSER_ROOT_VERSION=$ROOT_VERSION" >> "$GITHUB_ENV"
+            echo "COMPOSER_ROOT_VERSION=${{ env.ROOT_VERSION }}" >> "$env:GITHUB_ENV"
 
       - name: Cache composer dependencies
         uses: actions/cache@v5