changed docker-build action

.github/workflows/docker-build.yml

@@ -8,10 +8,6 @@ on:
     tags:
       - 'v*.*.*'
 
-env:
-  CREATE_IMAGE: "true"
-  IMAGE_TAG: "dev"
-
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -19,13 +15,13 @@ jobs:
       - name: set docker image tag
         run: |
           if [[ "${{ github.ref }}" == "refs/heads/dev" ]]; then
-            echo "IMAGE_TAG=dev" >> $GITHUB_ENV
-            echo "CREATE_IMAGE=true" >> $GITHUB_ENV
+            echo "IMAGE_TAG=dev" >> "$GITHUB_ENV"
+            echo "CREATE_IMAGE=true" >> "$GITHUB_ENV"
           elif [[ "${{ github.ref_type }}" == "tag" ]]; then
             echo "IMAGE_TAG=${{ github.ref_name }}"
-            echo "CREATE_IMAGE=true" >> $GITHUB_ENV
+            echo "CREATE_IMAGE=true" >> "$GITHUB_ENV"
           else
-            echo "CREATE_IMAGE=false" >> $GITHUB_ENV
+            echo "CREATE_IMAGE=false" >> "$GITHUB_ENV"
           fi
 
       - name: Login to Docker Hub