chore: add copyright header automation

.copywrite.hcl

@@ -0,0 +1,15 @@
+schema_version = 1
+
+project {
+  license        = "MPL-2.0"
+  copyright_year = 2021
+
+  # (OPTIONAL) A list of globs that should not have copyright/license headers.
+  # Supports doublestar glob patterns for more flexibility in defining which
+  # files or folders should be ignored
+  header_ignore = [
+    # "vendors/**",
+    # "**autogen**",
+    "**/node_modules/**",
+  ]
+}

.projenrc.ts

@@ -158,4 +158,14 @@ new TextFile(project, "src/inputs.ts", {
 });
 project.prettier?.addIgnorePattern("src/inputs.ts");
 
+// Add copywrite headers to all files
+project.buildWorkflow?.addPostBuildSteps(
+  {
+    name: "Setup Copywrite tool",
+    uses: "hashicorp/setup-copywrite@3ace06ad72e6ec679ea8572457b17dbc3960b8ce", // v1.0.0
+    with: { token: "${{ secrets.GITHUB_TOKEN }}" },
+  },
+  { name: "Add headers using Copywrite tool", run: "copywrite headers" }
+);
+
 project.synth();