Made "github:pages:enable" action idempotent

Signed-off-by: Bogdan Nechyporenko <bnechyporenko@bol.com>

.changeset/common-bats-enjoy.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder-backend-module-github': patch
+---
+
+Made "github:pages:enable" action idempotent

plugins/scaffolder-backend-module-github/src/actions/githubPagesEnable.ts

@@ -118,16 +118,21 @@ export function createGithubPagesEnableAction(options: {
         `Attempting to enable GitHub Pages for ${owner}/${repo} with "${buildType}" build type, on source branch "${sourceBranch}" and source path "${sourcePath}"`,
       );
 
-      await client.request('POST /repos/{owner}/{repo}/pages', {
-        owner: owner,
-        repo: repo,
-        build_type: buildType,
-        source: {
-          branch: sourceBranch,
-          path: sourcePath,
-        },
-        headers: {
-          'X-GitHub-Api-Version': '2022-11-28',
+      await ctx.checkpoint({
+        key: `enabled.github.pages.${owner}.${repo}`,
+        fn: async () => {
+          await client.request('POST /repos/{owner}/{repo}/pages', {
+            owner: owner,
+            repo: repo,
+            build_type: buildType,
+            source: {
+              branch: sourceBranch,
+              path: sourcePath,
+            },
+            headers: {
+              'X-GitHub-Api-Version': '2022-11-28',
+            },
+          });
         },
       });