more error messages

Author: marcoieni

src/ci/citool/src/jobs.rs

@@ -85,14 +85,14 @@ impl JobDatabase {
 }
 
 pub fn load_job_db(db: &str) -> anyhow::Result<JobDatabase> {
-    let mut db: Value = serde_yaml::from_str(db)?;
+    let mut db: Value = serde_yaml::from_str(db).context("failed to parse YAML content")?;
 
     // We need to expand merge keys (<<), because serde_yaml can't deal with them
     // `apply_merge` only applies the merge once, so do it a few times to unwrap nested merges.
-    db.apply_merge()?;
-    db.apply_merge()?;
+    db.apply_merge().context("failed to apply merge keys")?;
+    db.apply_merge().context("failed to apply merge keys")?;
 
-    let db: JobDatabase = serde_yaml::from_value(db)?;
+    let db: JobDatabase = serde_yaml::from_value(db).context("failed to parse job database")?;
     Ok(db)
 }