build: remove create env step from actions.

.github/workflows/release-build.yml

@@ -19,9 +19,6 @@ jobs:
       - uses: subosito/flutter-action@v1
         with:
           channel: 'stable'
-      - uses: SpicyPizza/create-envfile@v1
-        with:
-          envkey_sentryDSN: ${{ secrets.SENTRY_DSN }}
       - name: Set up Flutter
         run: flutter pub get
       - name: Generate files with Builder