attempt to fill flash size

Author: brentru

.github/workflows/build-clang-doxy.yml

@@ -340,6 +340,7 @@ jobs:
             --flash_mode ${{fromJson(steps.get_board_json.outputs.boardJson).esptool.flashMode}} \
             --flash_freq ${{fromJson(steps.get_board_json.outputs.boardJson).esptool.flashFreq}} \
             --flash_size ${{fromJson(steps.get_board_json.outputs.boardJson).esptool.flashSize}} \
+            --fill-flash-size ${{fromJson(steps.get_board_json.outputs.boardJson).esptool.flashSize}} \
             -o wippersnapper.${{ matrix.arduino-platform }}.littlefs.${{ env.WS_VERSION }}.combined.bin \
             ${{ matrix.offset }} wippersnapper.${{ matrix.arduino-platform }}.littlefs.${{ env.WS_VERSION }}.bootloader.bin \
             0x8000 wippersnapper.${{ matrix.arduino-platform }}.littlefs.${{ env.WS_VERSION }}.partitions.bin \