Use echo for CNAME (with newline)

Author: Andrej730

.github/workflows/bonsai-docs.yml

@@ -25,7 +25,7 @@ jobs:
           git -C bonsaibim_org_docs checkout -B main
           rm -rf bonsaibim_org_docs/*
           cp -r _build/html/* bonsaibim_org_docs/
-          printf "docs.bonsaibim.org" > bonsaibim_org_docs/CNAME
+          echo "docs.bonsaibim.org" > bonsaibim_org_docs/CNAME
           touch bonsaibim_org_docs/.nojekyll
           echo "<!-- Build: $(date +%s) -->" >> bonsaibim_org_docs/index.html
           git -C bonsaibim_org_docs add .