log errors from report generation

Signed-off-by: Lars Wirzenius <liw@liw.fi>

src/main.rs

@@ -68,7 +68,9 @@ fn fallible_main() -> Result<(), NativeError> {
         "update report page in {}\n",
         config.state.display()
     ))?;
-    report::build_report(&mut logfile, &config.state)?;
+    if let Err(e) = report::build_report(&mut logfile, &config.state) {
+        logfile.write(format!("report generation failed: {}", e))?;
+    }
     logfile.write(format!("radicle-native-ci ends: {:?}\n", result))?;
     result
 }