smoke_test: Create initial git commit before running cargo package/publish

This is a workaround for a cargo bug (rust-lang/cargo#14354).

Author: Turbo87

crates/crates_io_smoke_test/src/git.rs

@@ -0,0 +1,25 @@
+use crate::exit_status_ext::ExitStatusExt;
+use std::path::Path;
+use tokio::process::Command;
+
+#[allow(unstable_name_collisions)]
+pub async fn add_all(project_path: &Path) -> anyhow::Result<()> {
+    Command::new("git")
+        .args(["add", "--all"])
+        .current_dir(project_path)
+        .status()
+        .await?
+        .exit_ok()
+        .map_err(Into::into)
+}
+
+#[allow(unstable_name_collisions)]
+pub async fn commit(project_path: &Path, message: &str) -> anyhow::Result<()> {
+    Command::new("git")
+        .args(["commit", "--message", message])
+        .current_dir(project_path)
+        .status()
+        .await?
+        .exit_ok()
+        .map_err(Into::into)
+}

crates/crates_io_smoke_test/src/main.rs

@@ -1,6 +1,7 @@
 mod api;
 mod cargo;
 mod exit_status_ext;
+mod git;
 
 #[macro_use]
 extern crate tracing;
@@ -224,5 +225,14 @@ description = "test crate"
             .context("Failed to write `README.md` file content")?;
     }
 
+    info!("Creating initial git commit…");
+    git::add_all(&project_path)
+        .await
+        .context("Failed to add initial changes to git")?;
+
+    git::commit(&project_path, "initial commit")
+        .await
+        .context("Failed to commit initial changes")?;
+
     Ok(project_path)
 }