test(aya): iter: Disable the init system assertion in containers

It's hard to predict what's the PID of the first process in a container.
Use this assertion only on non-containerized systems.

test/integration-test/src/tests/iter.rs

@@ -1,4 +1,4 @@
-use std::io::BufRead;
+use std::{env, io::BufRead, path::Path};
 
 use aya::{programs::Iter, Btf, Ebpf};
 use test_log::test;
@@ -20,11 +20,15 @@ fn iter_task() {
     let line_init = lines.next().unwrap().unwrap();
 
     assert_eq!(line_title, "tgid     pid      name");
-    let expected_values = ["1        1        init", "1        1        systemd"];
+    // It's hard to predict what's the PID of the first process in a container.
-    assert!(
+    // Use this assertion only on non-containerized systems.
-        expected_values.contains(&line_init.as_str()),
+    if !Path::new("/.dockerenv").exists() && env::var_os("container").is_none() {
-        "Unexpected line_init value: '{}', expected one of: {:?}",
+        let expected_values = ["1        1        init", "1        1        systemd"];
-        line_init,
+        assert!(
-        expected_values
+            expected_values.contains(&line_init.as_str()),
-    );
+            "Unexpected line_init value: '{}', expected one of: {:?}",
+            line_init,
+            expected_values
+        );
+    }
 }