Update nightlydockerimages.yml

Author: KoenZomers

.github/workflows/nightlydockerimages.yml

@@ -31,7 +31,7 @@ jobs:
 
     - name: Define version
       run: |
-        VERSION="$(cat ./version.txt)"
+        echo "VERSION=$(cat ./version.txt)" >> $GITHUB_ENV
         
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v2
@@ -49,9 +49,9 @@ jobs:
         file: ./docker/linux-arm32.dockerfile
         push: true
         platforms: linux/arm/v7
-        tags: ${{ secrets.DOCKER_ORG }}/powershell:$VERSION-linux-arm32
+        tags: ${{ secrets.DOCKER_ORG }}/powershell:${{ env.VERSION }}-linux-arm32
         build-args: |
-          PNP_VERSION=$VERSION
+          PNP_VERSION=${{ env.VERSION }}
           
   publish-docker-linux-arm64:
     runs-on: ubuntu-24.04-arm