fix(compose): disable MSYS path conversion in run.sh

[tonbistudio]

Problem

Under Git Bash on Windows, MSYS rewrites absolute container paths in command arguments before docker receives them:

$ ./run.sh add-member <pubkey>
OCI runtime exec failed: exec failed: unable to start container process:
exec: "C:/Program Files/Git/usr/local/bin/buzz-admin":
stat C:/Program Files/Git/usr/local/bin/buzz-admin: no such file or directory

/usr/local/bin/buzz-admin was converted to a Windows Git-installation path inside the container. This breaks add-member, remove-member, and list-members — the documented way to populate a closed relay — on the platform most likely to be running a first local deployment (Windows users must already use Git Bash to run run.sh at all).

Fix

export MSYS_NO_PATHCONV=1 at the top of run.sh. The variable is only interpreted by Git-for-Windows' MSYS layer; it is a no-op in every other shell, so macOS/Linux behavior is unchanged.

Testing

• Reproduced the failure in Git Bash on Windows 11; with MSYS_NO_PATHCONV=1 exported, add-member/list-members work against a live compose stack.
• Not re-tested on macOS/Linux; the variable is only read by Git for Windows' MSYS layer, so non-MSYS shells ignore it.

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