fix docker build command to use built image; remote old reference to final image

build.sh

@@ -2,9 +2,7 @@
 set -Eeuxo pipefail
 
 AKKOMA_COMMIT="dd17e0353a9efd66b19803d066ec45fa7d155886"
-LOCAL_COMMIT=$(git rev-parse HEAD)
-AKKOMA_BASE_IMAGE="registry.nrd.li/nrdli/akkoma-base:${AKKOMA_COMMIT}"
-AKKOMA_FINAL_IMAGE="registry.nrd.li/nrdli/akkoma:${LOCAL_COMMIT}"
+AKKOMA_BASE_IMAGE="registry.nrd.li/nrdli/akkoma:${AKKOMA_COMMIT}"
 
 # clone akkoma source code
 if [ -d akkoma ]; then
@@ -33,5 +31,6 @@ docker run --rm \
   -v "$(pwd)/prod.secret.exs:/config/prod.secret.exs" \
   -v "$(pwd)/.build.sh:/build.sh" \
   --entrypoint "" \
+  "${AKKOMA_BASE_IMAGE}" \
   /build.sh
 # docker push "${AKKOMA_FINAL_IMAGE}"