Append to existing RUSTFLAGS, instead of overwriting. (launchbadge#1582)

* Append to existing RUSTFLAGS, instead of overwriting. * Assemble RUSTFLAGS correctly. Co-authored-by: Thomas Kintscher <thomas@flowciety.de>

Author: tkintscher

sqlx-cli/src/prepare.rs

@@ -115,16 +115,16 @@ hint: This command only works in the manifest directory of a Cargo package."#
  bail!("`cargo clean` failed with status: {}", check_status);
  }
 
+ let mut rustflags = env::var("RUSTFLAGS").unwrap_or_default();
+ rustflags.push_str(&format!(
+ " --cfg __sqlx_recompile_trigger=\"{}\"",
+ SystemTime::UNIX_EPOCH.elapsed()?.as_millis()
+ ));
+
  Command::new(&cargo)
  .arg("check")
  .args(cargo_args)
- .env(
- "RUSTFLAGS",
- format!(
- "--cfg __sqlx_recompile_trigger=\"{}\"",
- SystemTime::UNIX_EPOCH.elapsed()?.as_millis()
- ),
- )
+ .env("RUSTFLAGS", rustflags)
  .env("SQLX_OFFLINE", "false")
  .status()?
  } else {