tmt: Remove 'target' directory on plan completion

Tmt seems to be copying the 'target' directory to /var/tmp/tmt/** when
running a test which might be eating up disk space. Remove all
'target' directories from `/var/tmp/tmt/**` after plan completion

Signed-off-by: Pragyan Poudyal <pragyanpoudyal41999@gmail.com>

Author: Johan-Liebert1

Justfile

@@ -205,7 +205,7 @@ test-composefs bootloader filesystem boot_type seal_state *ARGS:
         filesystem={{filesystem}} \
         boot_type={{boot_type}} \
         seal_state={{seal_state}} \
-            test-tmt --composefs-backend \
+            test-tmt-nobuild --composefs-backend \
                 --bootloader={{bootloader}} \
                 --filesystem={{filesystem}} \
                 --seal-state={{seal_state}} \

crates/xtask/src/tmt.rs

@@ -564,6 +564,9 @@ fn run_plan(
     // Log disk usage after each test run to help diagnose "no space left on device" failures
     println!("Disk usage after plan {}:", plan);
     let _ = cmd!(sh, "df -h").run();
+    let script = r#"find /var/tmp/tmt -type d -name target -exec rm -rf {} \;"#;
+    let _ = cmd!(sh, "sh -c {script}").run();
+    println!("==========================================");
 
     // Clean up VM regardless of test result (unless --preserve-vm is set)
     cleanup_vm();