fix: script.start with missing file

Fixes #2258

The issue was that the scripts couldn't be found, so it was just trying
to repeatedly read it from scripts.start.

Now if nodemon is in the scripts.start command it exits out the logic.

Author: remy

lib/config/exec.js

@@ -25,6 +25,12 @@ function execFromPackage() {
     }
 
     if (pkg.scripts && pkg.scripts.start) {
+      const parts = pkg.scripts.start.split(' ');
+
+      // fixes a loop issue where the script repeats over and over #2258
+      if (parts.includes('nodemon')) {
+        return null;
+      }
       return { exec: pkg.scripts.start };
     }
   } catch (e) {}