Describe the bug
The meson.sh script runs flatpak build with various bind mount parameters. At least 6 of those parameters point to local / developer specific bind mounts that would not otherwise work when ran by an end user. I don't know flatpak or Streamcontroller well enough to know what the meson.sh script does or the necessity of the .flatpak folder, so there may be no end user impact, but if the script does run locally, those bind mounts will not work.

To Reproduce
Steps to reproduce the behavior:

1. Go to '.flapak/' path in github
2. Click on 'meson.sh'
3. Scroll down to 'the flatpak build' line
4. See /home/jonathan within parameters

Expected behavior
I would expect for the script to be tailored to the install using the local user's home path, perhaps using $HOME environment variable instead of hard coded home directories.

Screenshots
Not applicable

Additional context
Enough context provided.

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