refactor: make GitSteps a dedicated step (#737)

src/execution_context.rs

@@ -1,6 +1,5 @@
 #![allow(dead_code)]
 use crate::executor::RunType;
-use crate::git::Git;
 use crate::sudo::Sudo;
 use crate::utils::{require_option, REQUIRE_SUDO};
 use crate::{config::Config, executor::Executor};
@@ -12,7 +11,6 @@ use std::sync::Mutex;
 pub struct ExecutionContext<'a> {
     run_type: RunType,
     sudo: Option<Sudo>,
-    git: &'a Git,
     config: &'a Config,
     /// Name of a tmux session to execute commands in, if any.
     /// This is used in `./steps/remote/ssh.rs`, where we want to run `topgrade` in a new
@@ -23,12 +21,11 @@ pub struct ExecutionContext<'a> {
 }
 
 impl<'a> ExecutionContext<'a> {
-    pub fn new(run_type: RunType, sudo: Option<Sudo>, git: &'a Git, config: &'a Config) -> Self {
+    pub fn new(run_type: RunType, sudo: Option<Sudo>, config: &'a Config) -> Self {
         let under_ssh = var("SSH_CLIENT").is_ok() || var("SSH_TTY").is_ok();
         Self {
             run_type,
             sudo,
-            git,
             config,
             tmux_session: Mutex::new(None),
             under_ssh,
@@ -44,10 +41,6 @@ impl<'a> ExecutionContext<'a> {
         self.run_type
     }
 
-    pub fn git(&self) -> &Git {
-        self.git
-    }
-
     pub fn sudo(&self) -> &Option<Sudo> {
         &self.sudo
     }