add builder shellcheck

diff --git a/builder/Containerfile.template b/builder/Containerfile.template
index b4ccad94eb2a14f1b1b49b5f1e0eae8a171e9ace..336f46e93c2dc4fe40ddfaaa413fc02d547d7048 100644 (file)
--- a/builder/Containerfile.template
+++ b/builder/Containerfile.template
@@ -18,6 +18,7 @@ RUN apt-get update \
        bats-support \
        bats-assert \
        sane-utils \
+       shellcheck \
        qpdf \
        pdftk-java \
        libtiff-tools \