chore: update Projen & implement best practices (#68)

Updates this repo to start using best practices for Projen projects that
we've been using elsewhere, e.g. enabling automerge, etc. Also updates
all GitHub Actions to the latest versions approved by TSCCR.

.projenrc.ts

@@ -10,22 +10,24 @@ import {
   GitHubActionTypeScriptProject,
   RunsUsing,
 } from "projen-github-action-typescript";
+import { AutoApprove } from "./projenrc/auto-approve";
+import { Automerge } from "./projenrc/automerge";
 import { CustomizedLicense } from "./projenrc/customized-license";
 import { LockIssues } from "./projenrc/lock-issues";
 import { UpdateGitTags } from "./projenrc/update-tags";
 
 const githubActionPinnedVersions = {
-  "actions/checkout": "8e5e7e5ab8b370d6c329ec480221332ada57f0ab", // v3.5.2
-  "actions/upload-artifact": "0b7f8abb1508181956e8e162db84b466c27e18ce", // v3.1.2
+  "actions/checkout": "c85c95e3d7251135ab7dc9ce3241c5835cc595a9", // v3.5.3
   "actions/download-artifact": "9bc31d5ccc31df68ecc42ccf4149144866c47d8a", // v3.0.2
-  "dessant/lock-threads": "c1b35aecc5cdb1a34539d14196df55838bb2f836", // v4.0.0
+  "actions/setup-node": "5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d", // v3.8.1
+  "actions/stale": "1160a2240286f5da8ec72b1c0816ce2481aabf84", // v8.0.0
+  "actions/upload-artifact": "0b7f8abb1508181956e8e162db84b466c27e18ce", // v3.1.2
   "amannn/action-semantic-pull-request":
     "c3cd5d1ea3580753008872425915e343e351ab54", // v5.2.0
-  "actions/setup-node": "64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c", // v3.6.0
-  "actions/stale": "1160a2240286f5da8ec72b1c0816ce2481aabf84", // v8.0.0
+  "dessant/lock-threads": "be8aa5be94131386884a6da4189effda9b14aa21", // v4.0.1
   "peter-evans/create-pull-request": "284f54f989303d2699d373481a0cfa13ad5a6666", // v5.0.1
-  "slackapi/slack-github-action": "e28cf165c92ffef168d23c5c9000cffc8a25e117", // v1.24.0
   "pr-mpt/actions-semver-aliases": "01b2241f545f14efe72edaa2fcec49705dbe910d", // v2.0.0
+  "slackapi/slack-github-action": "e28cf165c92ffef168d23c5c9000cffc8a25e117", // v1.24.0
 };
 
 const inputs = {
@@ -86,16 +88,19 @@ const inputs = {
 
 const repoName = "terraform-cdk-action";
 const project = new GitHubActionTypeScriptProject({
-  defaultReleaseBranch: "main",
   name: repoName,
-  githubOptions: {
-    mergify: false,
-    pullRequestLint: true,
-    workflows: true,
-  },
-  prettier: true,
+  description:
+    "The Terraform CDK GitHub Action allows you to run CDKTF as part of your CI/CD workflow.",
+  repository: `https://github.com/hashicorp/${repoName}.git`,
+  authorName: "HashiCorp",
+  authorUrl: "https://hashicorp.com",
+  authorOrganization: true,
+  defaultReleaseBranch: "main",
   projenrcTs: true,
-  licensed: false, // we do supply our own license file with a custom header
+  prettier: true,
+  licensed: false,
+  pullRequestTemplate: false,
+  mergify: false,
   depsUpgradeOptions: {
     workflowOptions: {
       labels: ["automerge", "dependencies"],
@@ -109,6 +114,7 @@ const project = new GitHubActionTypeScriptProject({
   stale: true,
   staleOptions: {
     issues: {
+      exemptLabels: ["backlog", "help wanted"],
       staleLabel: "stale",
       daysBeforeStale: 30,
       staleMessage:
@@ -119,6 +125,7 @@ const project = new GitHubActionTypeScriptProject({
         "I'm closing this issue because we haven't heard back in 60 days. ⌛️ If you still need help, feel free to reopen the issue!",
     },
     pullRequest: {
+      exemptLabels: ["backlog", "help wanted"],
       staleLabel: "stale",
       daysBeforeStale: 60,
       staleMessage:
@@ -152,16 +159,11 @@ const project = new GitHubActionTypeScriptProject({
     "@actions/tool-cache",
     "@hashicorp/js-releases",
   ],
-  devDeps: [
-    "projen-github-action-typescript",
-    "@types/node",
-    "@types/fs-extra",
-  ],
-
-  // description: undefined,  /* The description is just a string that helps people understand the purpose of the package. */
-  // packageName: undefined,  /* The "name" in package.json. */
+  devDeps: ["projen-github-action-typescript@^0.0.392", "@types/fs-extra"],
 });
 
+new Automerge(project);
+new AutoApprove(project);
 new CustomizedLicense(project);
 new LockIssues(project);
 new UpdateGitTags(project);
@@ -190,6 +192,12 @@ import * as core from "@actions/core";`,
 });
 project.prettier?.addIgnorePattern("src/inputs.ts");
 
+project.addPackageIgnore("scripts");
+project.addPackageIgnore("examples");
+project.addPackageIgnore("projenrc");
+project.addPackageIgnore("/.projenrc.ts");
+
+project.addPackageIgnore(".copywrite.hcl");
 // Add copywrite headers to all files
 project.buildWorkflow?.addPostBuildSteps(
   {
@@ -242,4 +250,19 @@ project.release?.addJobs({
   },
 });
 
+const releaseWorkflow = project.tryFindObjectFile(
+  ".github/workflows/release.yml"
+);
+releaseWorkflow?.addOverride("on.push", {
+  branches: ["main"],
+  "paths-ignore": [
+    // don't do a release if the change was only to these files/directories
+    "examples/**",
+    ".github/ISSUE_TEMPLATE/**",
+    ".github/CODEOWNERS",
+    ".github/dependabot.yml",
+    ".github/**/*.md",
+  ],
+});
+
 project.synth();