update latest install scripts

* Use new .NET CDN URL

* Update to latest install-dotnet scripts

* Use signed version of new `install-dotnet.ps1`

* Add fallback to old CDN URL

.github/dependabot.yml

@@ -0,0 +1,22 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  # Enable version updates for npm
+  - package-ecosystem: 'npm'
+    # Look for `package.json` and `lock` files in the `root` directory
+    directory: '/'
+    # Check the npm registry for updates every day (weekdays)
+    schedule:
+      interval: 'weekly'
+
+  # Enable version updates for GitHub Actions
+  - package-ecosystem: 'github-actions'
+    # Workflow files stored in the default location of `.github/workflows`
+    # You don't need to specify `/.github/workflows` for `directory`. You can use `directory: "/"`.
+    directory: '/'
+    schedule:
+      interval: 'weekly'

dist/setup/index.js

@@ -93806,7 +93806,13 @@ class DotnetVersionResolver {
                 allowRetries: true,
                 maxRetries: 3
             });
-            const response = yield httpClient.getJson(DotnetVersionResolver.DotnetCoreIndexUrl);
+            let response;
+            try {
+                response = yield httpClient.getJson(DotnetVersionResolver.DotnetCoreIndexUrl);
+            }
+            catch (error) {
+                response = yield httpClient.getJson(DotnetVersionResolver.DotnetCoreIndexFallbackUrl);
+            }
             const result = response.result || {};
             const releasesInfo = result['releases-index'];
             const releaseInfo = releasesInfo.find(info => {
@@ -93822,6 +93828,7 @@ class DotnetVersionResolver {
 }
 exports.DotnetVersionResolver = DotnetVersionResolver;
 DotnetVersionResolver.DotnetCoreIndexUrl = 'https://builds.dotnet.microsoft.com/dotnet/release-metadata/releases-index.json';
+DotnetVersionResolver.DotnetCoreIndexFallbackUrl = 'https://dotnetcli.azureedge.net/dotnet/release-metadata/releases-index.json';
 class DotnetInstallScript {
     constructor() {
         this.scriptName = utils_1.IS_WINDOWS ? 'install-dotnet.ps1' : 'install-dotnet.sh';

src/installer.ts

@@ -101,9 +101,18 @@ export class DotnetVersionResolver {
       allowRetries: true,
       maxRetries: 3
     });
-    const response = await httpClient.getJson<any>(
-      DotnetVersionResolver.DotnetCoreIndexUrl
-    );
+
+    let response;
+    try {
+      response = await httpClient.getJson<any>(
+        DotnetVersionResolver.DotnetCoreIndexUrl
+      );
+    } catch (error) {
+      response = await httpClient.getJson<any>(
+        DotnetVersionResolver.DotnetCoreIndexFallbackUrl
+      );
+    }
+
     const result = response.result || {};
     const releasesInfo: any[] = result['releases-index'];
 
@@ -123,6 +132,8 @@ export class DotnetVersionResolver {
 
   static DotnetCoreIndexUrl =
     'https://builds.dotnet.microsoft.com/dotnet/release-metadata/releases-index.json';
+  static DotnetCoreIndexFallbackUrl =
+    'https://dotnetcli.azureedge.net/dotnet/release-metadata/releases-index.json';
 }
 
 export class DotnetInstallScript {