Use the Jenkins-style DEB output path and fix the copy to the packages-out mount

- Document --package-output-dir "${WORKSPACE}/rpms/${PROJECT}/${OS_VERSION}/"
  (Jenkins convention) in the usage examples
- The in-container copy step now copies to the real mount point
  /workspace/packages-out instead of ${PACKAGE_OUTPUT_DIR}, which is a host
  path that does not exist inside the container (the copy was a silent
  no-op; packages reached the host directly via make_rpm's
  --output_dir /workspace/rpms/... on the workspace mount)
- Skip the copy when the host output directory is the same directory as
  make_rpm's output dir (stat device:inode guard) - which is exactly the
  case for the Jenkins-style path above, where make_rpm already writes the
  packages in place

qt6-after/qt6-migrated-legatus/new_docker_build.sh

@@ -68,7 +68,8 @@ Examples:
   ./new_docker_build.sh --docker-image legatus-qt6:1.0
   ./new_docker_build.sh --delete-prebuilt-image --docker-image legatus-qt6:1.0
   ./new_docker_build.sh --docker-image legatus-qt6:1.0 \
-    --run-jenkins-builder --package-output-dir /path/to/rpms/guez/26.04
+    --run-jenkins-builder \
+    --package-output-dir "${WORKSPACE}/rpms/${PROJECT}/${OS_VERSION}/"
 EOF
 }
 
@@ -428,7 +429,6 @@ RELEASE_BUILD="${RELEASE_BUILD:-ON}"
 RUN_CTEST="${RUN_CTEST:-ON}"
 # Packaging variables
 RUN_JENKINS_BUILDER="${RUN_JENKINS_BUILDER:-OFF}"
-PACKAGE_OUTPUT_DIR="${PACKAGE_OUTPUT_DIR:-/workspace/packages-out}"
 LTS_VERSION="${LTS_VERSION:-1.0}"
 PROJECT="${PROJECT:-guez}"
 GUEZ_MODE="${GUEZ_MODE:-ON}"
@@ -534,16 +534,26 @@ if [[ "${RUN_JENKINS_BUILDER}" == "ON" ]]; then
     exit 1
   fi
 
-  # Copy produced DEB packages to the packages-out mount so they are
+  # Copy produced DEB packages to the packages-out mount (host:
+  # ${PACKAGE_OUTPUT_DIR}, container: /workspace/packages-out) so they are
   # available on the host after the container exits.
-  mkdir -p "${PACKAGE_OUTPUT_DIR}"
+  # make_rpm already writes to /workspace/rpms/... (the host workspace
+  # mount), so when the host's PACKAGE_OUTPUT_DIR is that same directory
+  # the packages are already in place - skip copying onto themselves.
+  DEST_DIR=/workspace/packages-out
+  mkdir -p "${DEST_DIR}"
   shopt -s nullglob
   for deb in "/workspace/rpms/${PROJECT}/${OS_VERSION}/"*.deb; do
-    cp -f "${deb}" "${PACKAGE_OUTPUT_DIR}/"
+    base="$(basename "${deb}")"
+    if [[ -e "${DEST_DIR}/${base}" ]] &&
+       [[ "$(stat -c '%d:%i' "${deb}")" == "$(stat -c '%d:%i' "${DEST_DIR}/${base}")" ]]; then
+      continue
+    fi
+    cp -f "${deb}" "${DEST_DIR}/"
   done
   shopt -u nullglob
-  log_info "DEB packages copied to ${PACKAGE_OUTPUT_DIR}:"
-  ls -lh "${PACKAGE_OUTPUT_DIR}/"
+  log_info "DEB packages available in ${DEST_DIR} (host: ${PACKAGE_OUTPUT_DIR:-unknown}):"
+  ls -lh "${DEST_DIR}/"
 else
   log_info "Skipping DEB package production"
 fi