ci: Add copywrite workflow and makefile target. (#43)

Author: jrasell

.copywrite.hcl

@@ -0,0 +1,6 @@
+schema_version = 1
+
+project {
+  license        = "MIT"
+  copyright_year = 2013
+}

.github/workflows/copywrite.yml

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+name: Check Copywrite Headers
+
+on:
+  pull_request:
+  push:
+    branches:
+      - "main"
+
+jobs:
+  copywrite:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          fetch-depth: 0
+      - uses: hashicorp/setup-copywrite@32638da2d4e81d56a0764aa1547882fc4d209636 # v1.1.3
+        name: Setup Copywrite
+        with:
+          version: v0.25.3
+          archive-checksum: e43f4b72fff3f219c5a5f883438d63edd5b68f5bea90a5d18abb3001c8c3aedc
+      - name: Check Header Compliance
+        run: make copywriteheaders
+permissions:
+  contents: read

Makefile

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+default: copywriteheaders
+
+.PHONY: copywriteheaders
+copywriteheaders:
+	@echo "==> Running copywrite headers plan..."
+	@copywrite headers --plan
+	@echo "==> Done"
+
+.PHONY: deps
+deps:
+	@go install github.com/hashicorp/copywrite@b3e6599f43beff698f471c6f46888045453fa030 # v0.25.3

codec/internal/testdata/raft.go

@@ -1,3 +1,6 @@
+// Copyright IBM Corp. 2013, 2026
+// SPDX-License-Identifier: MIT
+
 package testdata
 
 import "time"

codec/internal/testdata/raft_v055.go

@@ -1,3 +1,6 @@
+// Copyright IBM Corp. 2013, 2026
+// SPDX-License-Identifier: MIT
+
 package testdata
 
 import "time"

codec/internal/testdata/raft_v115.go

@@ -1,3 +1,6 @@
+// Copyright IBM Corp. 2013, 2026
+// SPDX-License-Identifier: MIT
+
 package testdata
 
 import "time"

codec/internal/testdata/raft_v116.go

@@ -1,3 +1,6 @@
+// Copyright IBM Corp. 2013, 2026
+// SPDX-License-Identifier: MIT
+
 package testdata
 
 import "time"