fix $BASE_IMAGE typo

Signed-off-by: Daniel Chambre <smiyc@pm.me>

Author: smiyc

content/blog/building-images-bake/index.md

@@ -48,7 +48,7 @@ extensions = [
 target "myimage" {
   dockerfile-inline = <<EOT
 ARG BASE_IMAGE="ghcr.io/cloudnative-pg/postgresql:16.9-standard-bookworm"
-FROM $BAS_EIMAGE AS myimage
+FROM $BASE_IMAGE AS myimage
 ARG EXTENSIONS
 USER root
 RUN apt-get update && \