ci: fix winget action

.github/workflows/post-release.yml

@@ -90,6 +90,13 @@ jobs:
   winget:
     runs-on: windows-latest
     steps:
+      - name: Set env
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      - name: Test env
+        run: |
+          echo $RELEASE_VERSION
+
       - name: Make sure you're not on master/main/nightly...
         run: |
           if [[ $RELEASE_VERSION == "master" || $RELEASE_VERSION == "main" || $RELEASE_VERSION == "nightly" ]]; then