diff --git a/README.adoc b/README.adoc
index 04a1bf1..3a1aa77 100644
--- a/README.adoc
+++ b/README.adoc
@@ -114,7 +114,10 @@ All tests run in CI with Github Actions. Some commands link:.github/workflows/fa
 
 === Unit tests
 
-Run locally the unit tests for `bb` language:
+Run locally the unit tests for OpenFaaS Function template `bb` language.
+
+The requirement is that babashka (`bb`) is https://github.com/babashka/babashka#installation[installed].
+
 [source, bash]
 ----
 cd template/bb
diff --git a/template/bb/Dockerfile b/template/bb/Dockerfile
index eaf1dbb..c3eefa1 100644
--- a/template/bb/Dockerfile
+++ b/template/bb/Dockerfile
@@ -18,11 +18,12 @@ RUN addgroup --system app && adduser --system --ingroup app app && \
 USER app
 WORKDIR $HOME
 
-COPY index.clj function/bb.edn ./
-COPY lib ./
-COPY function function
+COPY --chown=app:app index.clj function/bb.edn ./
+COPY --chown=app:app lib ./
+COPY --chown=app:app function function
 
-RUN bb --deps-root function prepare && bb --deps-root function print-deps
+RUN rm function/bb.edn && \
+    bb --deps-root function prepare && bb --deps-root function print-deps
 
 ENV mode="http"
 ENV upstream_url="http://127.0.0.1:8082"