Update main.yml

.github/workflows/main.yml

@@ -16,8 +16,8 @@ jobs:
   # This workflow contains a single job called "build"
   build:
     env:
-      - DOCKER_HOST: tcp://docker:2375/
-      - DOCKER_DRIVER: overlay2
+      DOCKER_HOST: tcp://docker:2375/
+      DOCKER_DRIVER: overlay2
     # The type of runner that the job will run on
     runs-on: ubuntu-latest
     container: