feat: add retry (#79)

resolves #71

- Add p-retry library
- Extract logic to new functions to improve the usage of retry logic

tests/main-token-get-owner-set-repo-fail-response.test.js

@@ -0,0 +1,39 @@
+import { test } from "./main.js";
+
+// Verify `main` retry when  the GitHub API returns a 500 error.
+await test((mockPool) => {
+  process.env.INPUT_OWNER = 'actions'
+  process.env.INPUT_REPOSITORIES = 'failed-repo';
+  const owner = process.env.INPUT_OWNER
+  const repo = process.env.INPUT_REPOSITORIES
+  const mockInstallationId = "123456";
+
+  mockPool
+    .intercept({
+      path: `/repos/${owner}/${repo}/installation`,
+      method: "GET",
+      headers: {
+        accept: "application/vnd.github.v3+json",
+        "user-agent": "actions/create-github-app-token",
+        // Intentionally omitting the `authorization` header, since JWT creation is not idempotent.
+      },
+    })
+    .reply(500, 'GitHub API not available')
+    
+    mockPool
+    .intercept({
+      path: `/repos/${owner}/${repo}/installation`,
+      method: "GET",
+      headers: {
+        accept: "application/vnd.github.v3+json",
+        "user-agent": "actions/create-github-app-token",
+        // Intentionally omitting the `authorization` header, since JWT creation is not idempotent.
+      },
+    })
+    .reply(
+      200,
+      { id: mockInstallationId },
+      { headers: { "content-type": "application/json" } }
+    );
+
+});

tests/main-token-get-owner-set-to-user-fail-response.test.js

@@ -0,0 +1,36 @@
+import { test } from "./main.js";
+
+// Verify `main` successfully obtains a token when the `owner` input is set (to a user), but the `repositories` input isn’t set.
+await test((mockPool) => {
+  process.env.INPUT_OWNER = "smockle";
+  delete process.env.INPUT_REPOSITORIES;
+
+  // Mock installation id request
+  const mockInstallationId = "123456";
+  mockPool
+    .intercept({
+      path: `/orgs/${process.env.INPUT_OWNER}/installation`,
+      method: "GET",
+      headers: {
+        accept: "application/vnd.github.v3+json",
+        "user-agent": "actions/create-github-app-token",
+        // Intentionally omitting the `authorization` header, since JWT creation is not idempotent.
+      },
+    })
+    .reply(500, 'GitHub API not available')
+    mockPool
+    .intercept({
+      path: `/orgs/${process.env.INPUT_OWNER}/installation`,
+      method: "GET",
+      headers: {
+        accept: "application/vnd.github.v3+json",
+        "user-agent": "actions/create-github-app-token",
+        // Intentionally omitting the `authorization` header, since JWT creation is not idempotent.
+      },
+    })
+    .reply(
+      200,
+      { id: mockInstallationId },
+      { headers: { "content-type": "application/json" } }
+    );
+});

tests/snapshots/index.js.md

@@ -56,6 +56,21 @@ Generated by [AVA](https://avajs.dev).
 
     ''
 
+## main-token-get-owner-set-repo-fail-response.test.js
+
+> stderr
+
+    ''
+
+> stdout
+
+    `owner and repositories set, creating token for repositories "failed-repo" owned by "actions"␊
+    Failed to create token for "failed-repo" (attempt 1): GitHub API not available␊
+    ::add-mask::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
+    ␊
+    ::set-output name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
+    ::save-state name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a`
+
 ## main-token-get-owner-set-repo-set-to-many.test.js
 
 > stderr
@@ -98,6 +113,21 @@ Generated by [AVA](https://avajs.dev).
     ::set-output name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
     ::save-state name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a`
 
+## main-token-get-owner-set-to-user-fail-response.test.js
+
+> stderr
+
+    ''
+
+> stdout
+
+    `repositories not set, creating token for all repositories for given owner "smockle"␊
+    Failed to create token for "smockle" (attempt 1): GitHub API not available␊
+    ::add-mask::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
+    ␊
+    ::set-output name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a␊
+    ::save-state name=token::ghs_16C7e42F292c6912E7710c838347Ae178B4a`
+
 ## main-token-get-owner-set-to-user-repo-unset.test.js
 
 > stderr