Inconsistent splitting behavior fix

lib/installer.js

@@ -215,6 +215,7 @@ class DotnetCoreInstaller {
             if (downloadUrls.length == 0) {
                 throw `Could not construct download URL. Please ensure that specified version ${version} is valid.`;
             }
+            core.debug(`Got download urls ${downloadUrls}`);
             return downloadUrls;
         });
     }
@@ -276,6 +277,10 @@ class DotnetCoreInstaller {
             let legacyUrl = '';
             if (!!output && output.length > 0) {
                 let lines = output.split(os.EOL);
+                // Fallback to \n if initial split doesn't work (not consistent across versions)
+                if (lines.length === 1) {
+                    lines = output.split('\n');
+                }
                 if (!!lines && lines.length > 0) {
                     lines.forEach((line) => {
                         if (!line) {

src/installer.ts

@@ -232,6 +232,8 @@ export class DotnetCoreInstaller {
       throw `Could not construct download URL. Please ensure that specified version ${version} is valid.`;
     }
 
+    core.debug(`Got download urls ${downloadUrls}`);
+
     return downloadUrls;
   }
 
@@ -307,6 +309,11 @@ export class DotnetCoreInstaller {
     let legacyUrl: string = '';
     if (!!output && output.length > 0) {
       let lines: string[] = output.split(os.EOL);
+
+      // Fallback to \n if initial split doesn't work (not consistent across versions)
+      if (lines.length === 1) {
+        lines = output.split('\n');
+      }
       if (!!lines && lines.length > 0) {
         lines.forEach((line: string) => {
           if (!line) {