[server] Fix automated prebuilds for GitHub Enterprise repositories

Author: jankeromnes

components/dashboard/src/projects/NewProject.tsx

@@ -500,13 +500,14 @@ function GitProviders(props: {
         setErrorMessage(undefined);
 
         const token = await getGitpodService().server.getToken({ host: ap.host });
-        if (token) {
+        const isGitHubEnterprise = ap.authProviderType === "GitHub" && ap.host !== "github.com";
+        if (token && !(isGitHubEnterprise && !token.scopes.includes("public_repo"))) {
             props.onHostSelected(ap.host);
             return;
         }
         await openAuthorizeWindow({
             host: ap.host,
-            scopes: ap.requirements?.default,
+            scopes: isGitHubEnterprise ? ["public_repo"] : ap.requirements?.default,
             onSuccess: async () => {
                 props.onHostSelected(ap.host, true);
             },

components/server/src/projects/projects-service.ts

@@ -148,7 +148,7 @@ export class ProjectsService {
         const parsedUrl = RepoURL.parseRepoUrl(project.cloneUrl);
         const hostContext = parsedUrl?.host ? this.hostContextProvider.get(parsedUrl?.host) : undefined;
         const type = hostContext && hostContext.authProvider.info.authProviderType;
-        if (type === "GitLab" || type === "Bitbucket") {
+        if (type === "GitLab" || type === "Bitbucket" || (type === "GitHub" && parsedUrl?.host !== "github.com")) {
             const repositoryService = hostContext?.services?.repositoryService;
             if (repositoryService) {
                 // Note: For GitLab, we expect .canInstallAutomatedPrebuilds() to always return true, because earlier