docker: Handle arbitrary extra arguments

implemented in the configuration file and parsed from environment
variables.

src/docker/local.rs

@@ -41,6 +41,7 @@ pub(crate) fn run(
 
     let mut docker = engine.subcommand("run");
     docker.add_userns();
+    docker.add_extra_args(&options)?;
 
     // Podman on macOS doesn't support selinux labels, see issue #756
     #[cfg(target_os = "macos")]

src/docker/remote.rs

@@ -758,6 +758,9 @@ pub(crate) fn run(
             msg_info,
         )
         .wrap_err("could not determine mount points")?;
+    docker
+        .add_extra_args(&options)
+        .wrap_err("could not determine additional container arguments")?;
 
     docker
         .add_seccomp(engine.kind, target, &paths.metadata)

src/docker/shared.rs

@@ -955,6 +955,7 @@ pub(crate) trait DockerCommandExt {
         target: &Target,
         metadata: &CargoMetadata,
     ) -> Result<()>;
+    fn add_extra_args(&mut self, options: &DockerOptions) -> Result<()>;
     fn add_mounts(
         &mut self,
         options: &DockerOptions,
@@ -1164,6 +1165,16 @@ impl DockerCommandExt for Command {
         Ok(())
     }
 
+    fn add_extra_args(&mut self, options: &DockerOptions) -> Result<()> {
+        let extra_args = options.config.extra_args(&options.target)?;
+        if let Some(args) = extra_args {
+            args.iter().for_each(|arg| {
+                self.arg(arg);
+            });
+        }
+        Ok(())
+    }
+
     fn add_mounts(
         &mut self,
         options: &DockerOptions,