Fix action

Author: hovnatan

.github/workflows/pre_release.yml

@@ -28,7 +28,7 @@ jobs:
         with:
           push: true
           tags: superannotate/pythonsdk:dev
-          build-args: PIP_FLAGS="--pre"
+          build-args: PIP_FLAGS='--pre'
       - name: Set up Python
         uses: actions/setup-python@v2
         with: