Introduce License Finder to CI

.github/workflows/license.yml

@@ -0,0 +1,53 @@
+name: License Compliance
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  license_finder:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      # To make the success of this job a prerequisite for merging into the main branch,
+      # set a filter here instead of on: to determine whether or not to proceed to the next step.
+      - uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3.0.2
+        id: changes
+        with:
+          filters: |
+            target:
+              - .github/workflows/license.yml
+              - bun.lockb
+              - config/dependency_decisions.yml
+              - config/license_finder.yml
+              - package.json
+      - uses: oven-sh/setup-bun@v2
+        if: steps.changes.outputs.target == 'true'
+        with:
+          bun-version-file: "package.json"
+      - run: bun install
+        if: steps.changes.outputs.target == 'true'
+      - uses: ruby/setup-ruby@v1
+        if: steps.changes.outputs.target == 'true'
+        with:
+          ruby-version: '3.3'
+      - name: Install License Finder
+        if: steps.changes.outputs.target == 'true'
+        run: gem install -N license_finder
+      - name: Run License Finder
+        if: steps.changes.outputs.target == 'true'
+        run: license_finder
+
+      # Upload it once for reference only. If it seems unnecessary, you can stop uploading.
+      - name: Generate HTML report
+        if: steps.changes.outputs.target == 'true'
+        run: license_finder report --format=html > license-report.html
+      - name: Upload HTML artifact
+        if: steps.changes.outputs.target == 'true'
+        uses: actions/upload-artifact@v4
+        with:
+          name: license-report
+          path: license-report.html