Update publish.yml

Author: passplease

.github/workflows/publish.yml

@@ -43,7 +43,7 @@ jobs:
           gradle-version: '8.11.1'
 
       - name: Lowercase the repo name
-        run: echo "REPO=${GITHUB_REPOSITORY,,}" >> ${{ GITHUB_ENV }}
+        run: echo "lower_repository=${GITHUB_REPOSITORY,,}" >> $GITHUB_ENV
 
       - name: Build and push Docker image
         run: gradle pushDockerImage
@@ -57,7 +57,7 @@ jobs:
       packages: read
     runs-on: ubuntu-22.04
     container:
-      image: ghcr.io/${{ env.REPO }}:1.20.1-6.0.0-forge
+      image: ghcr.io/${{ env.lower_repository }}:1.20.1-6.0.0-forge
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
@@ -98,7 +98,7 @@ jobs:
     needs: build-docker-image
     runs-on: ubuntu-22.04
     container:
-      image: ghcr.io/${{ env.REPO }}:1.20.1-6.0.0-forge
+      image: ghcr.io/${{ env.lower_repository }}:1.20.1-6.0.0-forge
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}