Add workflow to automatically update LICENSE file with recipe licenses

Originally from meta-freescale-3rdparty.

Signed-off-by: Abner C. Paula <abner.cordeiro@ossystems.com.br>
(cherry picked from commit 77f6565f4a)

.github/workflows/update-license-file.yml

@@ -0,0 +1,35 @@
+name: Update LICENSE file
+
+on:
+  push:
+    paths:
+      - "**/*.bb"
+      - "**/*.inc"
+  schedule:
+    - cron: "0 0 * * *" # Runs daily at midnight
+  workflow_dispatch: # Allows manual run
+
+jobs:
+  update-license:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Run license generation script
+        run: |
+          ./scripts/generate-license-file
+
+      - name: Commit and push LICENSE file
+        run: |
+          git config --local user.name "github-actions[bot]"
+          git config --local user.email "github-actions[bot]@users.noreply.github.com"
+          git add LICENSE
+          if ! git diff-index --quiet HEAD; then
+            git commit -m "Auto-update LICENSE file with current recipe licenses"
+            git push
+          fi
+
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

scripts/generate-license-file

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# Create or clear the LICENSE file
+echo "# License Information" > LICENSE
+echo "" >> LICENSE
+echo "This file lists all licenses used by recipes in the meta-freescale-3rdparty layer." >> LICENSE
+echo "" >> LICENSE
+
+# Find all .bb and .inc files and extract license information
+find . -type f \( -name "*.bb" -o -name "*.inc" \) | while read -r file; do
+    # Extract the license line from each recipe file, if it exists
+    license_line=$(grep -i "^LICENSE" "$file")
+    if [ -n "$license_line" ]; then
+        echo "$file: $license_line" >> LICENSE
+    fi
+done
+
+echo "LICENSE file has been generated and updated with current recipe licenses."