stop using busted stackoverflow copypasta

in favor of a new one

.github/workflows/release.yml

@@ -37,7 +37,7 @@ jobs:
 
       - name: Tag and Push Image
         run: |
-          export IMAGE_NAME=$(echo "$IMAGE_NAME" | tr '[:lower:]')
+          export IMAGE_NAME=$(echo "$IMAGE_NAME" | awk 'print tolower($0)')
           echo $IMAGE_NAME
           env
           echo ${{ env.REGISTRY }}/$IMAGE_NAME:master