Added stm32 boards: STM32H7B3I_DK

ports/stm32/.gitlab-ci.yml

-.stm32: &stm32
-  stage: stm32
-  extends: .common
-  image: registry.gitlab.com/alelec/docker-arm-none-eabi:9.2.1
-  script:
-    - arm-none-eabi-gcc -v
-    - mkdir ${NAME}
-    - export BOARD=${CI_JOB_NAME}
-    - cd micropython/ports/stm32
-    - if [[ $CI_JOB_NAME == *_mboot ]] ; then
-        export BOARD=${CI_JOB_NAME::-6};
-        export USE_MBOOT=1;
-        make -C mboot BUILD=`pwd`/build BOARD=${CI_JOB_NAME::-6};
-        for ext in bin dfu elf hex map; 
-          do cp -v build/firmware.${ext} ${CI_PROJECT_DIR}/${NAME}/mboot.${ext}; 
-        done;
-        cp ../../tools/pydfu.py ${CI_PROJECT_DIR}/${NAME}/;
-      fi;
-    - make BOARD=${BOARD} BUILD=${CI_PROJECT_DIR}/${NAME} USE_MBOOT=${USE_MBOOT}
-  artifacts:
-    paths:
-      - ./*_*/firmware.*
-      - ./*_*/mboot.*
-      - ./*_*/pydfu.py
-
-stm32_update:
-  stage: update
-  extends: .git_config
-  variables:
-    GIT_SUBMODULE_STRATEGY: normal
-  script:
-    - python3 ports/stm32/update.py
-    - git checkout -b master || true   
-    - if ! $(git status -uno | grep -q "up to date"); then
-        git push origin master;
-      fi
-
-  only: [schedules, triggers]
-  
-
 
 ADAFRUIT_F405_EXPRESS:
   <<: *stm32
@@ -309,6 +269,12 @@ STM32F7DISC_mboot:
   <<: *stm32
   allow_failure: true
 
+STM32H7B3I_DK:
+  <<: *stm32
+STM32H7B3I_DK_mboot:
+  <<: *stm32
+  allow_failure: true
+
 STM32L476DISC:
   <<: *stm32
 STM32L476DISC_mboot: