Create an ephemeral preview deploy

msb run -d --name preview --replace \
  --memory 256M --max-duration 30m --copy-dir ./dist:/site \
  -p 127.0.0.1:4173:8080 \
  --net-default-egress deny --net-default-ingress allow \
  --security restricted --user 65534:65534 \
  python:3.13.14-alpine3.23 -- python -m http.server 8080 \
    --bind 0.0.0.0 --directory /site

msb run -d --name preview --replace `
  --memory 256M --max-duration 30m --copy-dir ./dist:/site `
  -p 127.0.0.1:4173:8080 `
  --net-default-egress deny --net-default-ingress allow `
  --security restricted --user 65534:65534 `
  python:3.13.14-alpine3.23 -- python -m http.server 8080 `
    --bind 0.0.0.0 --directory /site

until curl -fsS http://127.0.0.1:4173/ >/dev/null 2>&1; do sleep 1; done

do {
  curl.exe -fsS http://127.0.0.1:4173/ *> $null
  if ($LASTEXITCODE -ne 0) { Start-Sleep -Seconds 1 }
} until ($LASTEXITCODE -eq 0)

open http://127.0.0.1:4173

Start-Process http://127.0.0.1:4173