feat: Add support for NuShell scripts

template/templates/Containerfile.j2

@@ -35,6 +35,16 @@ RUN --mount=type=bind,from=stage-bins,src=/bins,dst=/tmp/bins \
   && cp /tmp/bins/* /usr/bin/ \
   && ostree container commit
 
+RUN --mount=type=bind,from={{ blue_build_utils::constants::NUSHELL_IMAGE }}:
+{%- if let Some(version) = nushell_version -%}
+{{ version }}
+{%- else -%}
+default
+{%- endif %},src=/nu,dst=/tmp/nu \
+  mkdir -p /usr/libexec/bluebuild/nu \
+  && cp -r /tmp/nu/* /usr/libexec/bluebuild/nu/ \
+  && ostree container commit
+
 RUN --mount=type=bind,from={{ build_scripts_image }},src=/scripts/,dst=/scripts/ \
   /scripts/pre_build.sh