Merge pull request #71 from nautobot/gha-fix

Update GHA per best practice

.github/workflows/auto-update.yml

@@ -9,9 +9,6 @@ env:
   DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
   DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
   HUB_URL: "https://hub.docker.com/v2/repositories/networktocode/nautobot-lab"
-  # ACTIONS_ALLOW_UNSECURE_COMMANDS is required to set the NAUTOBOT_VERSION
-  # environment variable
-  ACTIONS_ALLOW_UNSECURE_COMMANDS: true
 
 jobs:
   build:
@@ -57,7 +54,7 @@ jobs:
             echo "Nautobot and Nautobot Lab versions match."
             exit 0
           else
-            echo "::set-env name=NAUTOBOT_VERSION::$nautobot_version"
+            echo "NAUTOBOT_VERSION=$nautobot_version" >> "$GITHUB_ENV"
           fi
 
       - name: Build and push Nautobot Lab images