Hi, adding your block to the mounts is for development mode.
If you want to add a git based requirement you can add it in your config.yml under
OPENEDX_EXTRA_PIP_REQUIREMENTS:
- git+https://github.com/edly-io/h5pxblock.git
After this
perform following
tutor config save
tutor images build openedx
Or you can perform a short hand command
tutor config save --append OPENEDX_EXTRA_PIP_REQUIREMENTS=git+https://github.com/open-craft/xblock-poll.git
and then an image build
You can find the reference from here Install extra Xblocks and requirements