let cargo-binstall be optional

Author: 2bndy5

noxfile.py

@@ -1,5 +1,4 @@
 import logging
-import platform
 import re
 import sys
 import nox
@@ -36,22 +35,6 @@ def __init__(self, session: nox.Session):
                 "Found %s: %s" % (CARGO_BINSTALL, cargo_bins[CARGO_BINSTALL])
             )
             self.cargo_install_cmd = ("cargo", "binstall", "-y")
-        else:
-            ci_logger.info("Installing %s" % CARGO_BINSTALL)
-            match platform.system():
-                case "Windows":
-                    one_liner = """Set-ExecutionPolicy Unrestricted -Scope Process; iex (iwr "https://raw.githubusercontent.com/cargo-bins/cargo-binstall/main/install-from-binstall-release.ps1").Content"""
-                    session.run(*one_liner.split(), external=True)
-                case "Linux" | "Darwin":
-                    one_liner = "curl -L --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/cargo-bins/cargo-binstall/main/install-from-binstall-release.sh | bash"
-                    session.run(*one_liner.split(), external=True)
-                case _:
-                    session.run(
-                        *self.cargo_install_cmd,
-                        CARGO_BINSTALL,
-                        "--locked",
-                        external=True,
-                    )
 
     def check_install(self, req: str, session: nox.Session):
         """Use cargo to ensure `req` is installed.