ci: ignore copyright year changes in nitrogen validation

Simplify CI by removing duplicate validation from build-library job
and adding -I flag to ignore copyright year line changes.

Author: mfazekas

.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Validate Nitrogen Generated Code
         run: |
           yarn nitrogen
-          if ! git diff --exit-code nitrogen/generated/; then
+          if ! git diff --exit-code -I 'Copyright © [0-9]* Marc Rousavy @ Margelo' nitrogen/generated/; then
             echo "Error: nitrogen/generated/ is out of date. Please run 'yarn nitrogen' and commit the changes."
             exit 1
           fi
@@ -80,14 +80,6 @@ jobs:
       - name: Setup
         uses: ./.github/actions/setup
 
-      - name: Validate Nitrogen Generated Code
-        run: |
-          yarn nitrogen
-          if ! git diff --exit-code nitrogen/generated/; then
-            echo "Error: nitrogen/generated/ is out of date. Please run 'yarn nitrogen' and commit the changes."
-            exit 1
-          fi
-
       - name: Build package
         run: yarn prepare