Use ehrql rather than databuilder as canonical image name

And prevent attempts to update `databuilder` directly. Previously
updating `databuilder` would update the `ehrql` version, but not vice
versa so it was possible for them to get out of sync.

scripts/update-docker-image.sh

@@ -5,16 +5,22 @@ if test "${1:-}" == ""; then
   echo "usage: $0 image[:tag]"
   exit 1
 fi
+if [[ $1 == databuilder* ]]; then
+  echo "'databuilder' is deprecated as an image name, use 'ehrql' instead."
+  echo "Note that updating ehrql will automatically update the databuilder image."
+  exit 1
+fi
 set -x
+
 docker pull docker-proxy.opensafely.org/opensafely-core/$1
 docker tag docker-proxy.opensafely.org/opensafely-core/$1 ghcr.io/opensafely-core/$1
 # temp b/w compat tag
 docker tag docker-proxy.opensafely.org/opensafely-core/$1 ghcr.io/opensafely/$1
 
-# If the image being updated is databuilder, make sure we get the aliased ehrql tag too
-if [[ $1 == databuilder* ]]; then
-  image=$(echo "$1" | sed -r 's/[databuilder]+/ehrql/g')
-  echo "Updating ehrql image: $image"
+# If the image being updated is ehrql, make sure we get the aliased databuilder tag too
+if [[ $1 == ehrql* ]]; then
+  image=$(echo "$1" | sed -r 's/[ehrql]+/databuilder/g')
+  echo "Updating databuilder image: $image"
   docker pull docker-proxy.opensafely.org/opensafely-core/$image
   docker tag docker-proxy.opensafely.org/opensafely-core/$image ghcr.io/opensafely-core/$image
 fi