fix: image name must be all lowercase

Author: lherman-cs

.github/workflows/docker.yml

@@ -18,7 +18,7 @@ jobs:
     if: github.repository_owner == 'PulseBeamDev'
     timeout-minutes: 30
     env:
-      IMAGE_NAME: ghcr.io/${{ github.repository_owner }}/pulsebeam
+      IMAGE_NAME: ghcr.io/pulsebeamdev/pulsebeam
       IMAGE_TAG: ${{ github.ref_name }}
     steps:
       - name: Checkout repository