Add support for gpu-rent.vars and enhance git update functionality

- Updated .gitignore to include gpu-rent.vars.
- Modified env.example to introduce the UPDATE_GIT variable for controlling git updates during execution.
- Implemented Import-GpuRentVars function in gpu-rent.ps1 to load environment variables from gpu-rent.vars.
- Enhanced gpu-rent.sh to support loading variables from gpu-rent.vars and added logic for handling default and extra arguments.
- Updated CLI documentation to reflect the new gpu-rent.vars file and its usage in configuration.
- Improved bootstrap and provisioning logic to conditionally perform git updates based on the new configuration.

src/gpu_rent/bootstrap.py

@@ -16,8 +16,12 @@ def bootstrap_script() -> str:
     return files("gpu_rent.remote").joinpath("bootstrap.sh").read_text(encoding="utf-8")
 
 
-def run_bootstrap(cfg: Config, host: str, log: Log) -> None:
+def run_bootstrap(cfg: Config, host: str, log: Log, *, update: bool = True) -> None:
     log("bootstrap SwarmUI на VM (идемпотентно, без Docker)")
+    if update:
+        log("git update: SwarmUI on")
+    else:
+        log("git update: SwarmUI off (--no-update)")
     script = bootstrap_script()
     out = run_script_sudo(
         cfg,
@@ -25,7 +29,10 @@ def run_bootstrap(cfg: Config, host: str, log: Log) -> None:
         script,
         remote_path="/tmp/gpu-rent-bootstrap.sh",
         timeout=1800,
-        env={"SWARM_USER": cfg.ssh_user},
+        env={
+            "SWARM_USER": cfg.ssh_user,
+            "GPU_RENT_UPDATE_GIT": "1" if update else "0",
+        },
         log=log,
     )
     if "bootstrap ok" not in out: