Fix CI: skip main module download if already listed in flash.dmd

Co-authored-by: JohnAmadis <17320783+JohnAmadis@users.noreply.github.com>

Author: Copilot

modules/CMakeLists.txt

@@ -112,9 +112,30 @@ if(DMBOOT_FLASH_DMD_FILES)
         endif()
     endforeach()
 
-    # Download main module if specified (at the end of installation)
+    # Download main module if specified (at the end of installation),
+    # but only if it is not already listed in any flash.dmd file
     if(DMBOOT_MAIN_MODULE)
-        append_main_module_download_commands(_FLASH_DOWNLOAD_COMMANDS)
+        set(_MAIN_MODULE_IN_FLASH_DMD FALSE)
+        foreach(_DMD_FILE IN LISTS DMBOOT_FLASH_DMD_FILES)
+            file(STRINGS "${_DMD_FILE}" _DMD_LINES)
+            foreach(_LINE IN LISTS _DMD_LINES)
+                string(STRIP "${_LINE}" _LINE_STRIPPED)
+                if(NOT _LINE_STRIPPED MATCHES "^#" AND NOT _LINE_STRIPPED STREQUAL "")
+                    if(_LINE_STRIPPED STREQUAL "${DMBOOT_MAIN_MODULE}")
+                        set(_MAIN_MODULE_IN_FLASH_DMD TRUE)
+                        break()
+                    endif()
+                endif()
+            endforeach()
+            if(_MAIN_MODULE_IN_FLASH_DMD)
+                break()
+            endif()
+        endforeach()
+        if(NOT _MAIN_MODULE_IN_FLASH_DMD)
+            append_main_module_download_commands(_FLASH_DOWNLOAD_COMMANDS)
+        else()
+            message(STATUS "Main module '${DMBOOT_MAIN_MODULE}' is already listed in flash.dmd, skipping explicit download")
+        endif()
     endif()
 
     list(APPEND _FLASH_DOWNLOAD_COMMANDS