update resume builder container image url

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     container:
-      image: docker.pkg.github.com/mszep/pandoc_resume/resume_builder:latest
+      image: ghcr.io/mszep/pandoc_resume/resume_builder:latest
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}