- fixed shellcheck warnings

- fixed excludes
- minor fixes

build_release.sh

 #!/usr/bin/bash
-# Release build under Debian 10
+# Release build under Debian 11
 
 DATE="$(date +%F\ %T)"
 BRANCH="$(git branch --show-current)"
@@ -8,16 +8,21 @@ BUILD_ZIP="SLUB_SIP_Builder.version-${VERSION}.zip"
 BUILD_DIR="build"
 BUILD_ROOT="${BUILD_DIR}/SLUB_SIP_Builder"
 BUILD_SCRIPT=$(basename "$0")
-
-rm -rf ${BUILD_ZIP}
-rm -rf ${BUILD_DIR}
-mkdir -p ${BUILD_ROOT}
+rm -rf "${BUILD_ZIP}"
+rm -rf "${BUILD_DIR}"
+mkdir -p "${BUILD_ROOT}"
 rsync -av --exclude='.git'          --exclude='.idea'       --exclude='_Deparsed_XSubs.pm' \
           --exclude='.gitignore'    --exclude='tmp' \       --exclude='*.zip' \
-          --exclude=${BUILD_SCRIPT} --exclude=${BUILD_DIR}/ ./ ${BUILD_ROOT}
+          --exclude="${BUILD_SCRIPT}" --exclude="${BUILD_DIR}/" \
+          --exclude="*.iml" ./ "${BUILD_ROOT}"
 sed -i "/^#.*FILE:.*/a \
 #\n\
 #      VERSION: ${VERSION}\n\
 # RELEASE DATE: ${DATE}" ${BUILD_ROOT}/bin/slubsipbuilderbagit.pl
-cd ${BUILD_DIR}; zip -r ../${BUILD_ZIP} .; cd ..
-rm -rf ${BUILD_DIR}
\ No newline at end of file
+cd "${BUILD_DIR}" ||exit; zip -r ../"${BUILD_ZIP}" .; cd ..
+rm -rf "${BUILD_DIR}"
+if [[ -e "${BUILD_ZIP}" ]]; then
+  echo "release archived in file '${BUILD_ZIP}' :)"
+else
+  echo "something goes wrong :("
+fi
\ No newline at end of file