One more try

.github/workflows/ci.yml

@@ -245,7 +245,8 @@ jobs:
         install -Dm644 "LICENSE-APACHE" "${DPKG_DIR}/usr/share/doc/${DPKG_BASENAME}/LICENSE-APACHE"
 
         # Numbat prelude
-        cp -r "numbat/modules" "${DPKG_DIR}/usr/share/${DPKG_BASENAME}/"
+        mkdir "${DPKG_DIR}/usr/share/${DPKG_BASENAME}/modules"
+        cp -r numbat/modules/* "${DPKG_DIR}/usr/share/${DPKG_BASENAME}/modules"
 
         cat > "${DPKG_DIR}/usr/share/doc/${DPKG_BASENAME}/copyright" <<EOF
         Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/