ci: Add OpenSSF Scorecard workflow

.github/workflows/scorecard.yml

@@ -0,0 +1,53 @@
+name: Scorecard supply-chain security
+on:
+  branch_protection_rule:
+  schedule:
+    - cron: "22 6 * * 2"
+  push:
+    branches: [ "master" ]
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    permissions:
+
+      # Needed to upload the results to the code-scanning dashboard.
+      security-events: write
+
+      # Needed to publish the results and get a badge (see
+      # `publish_results` below).
+      id-token: write
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@v2.3.1
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
+          # - you want to enable the Branch-Protection check on a *public* repository, or
+          # - you are installing Scorecard on a *private* repository
+          # To create the PAT, follow the steps in https://github.com/ossf/scorecard-action?tab=readme-ov-file#authentication-with-fine-grained-pat-optional.
+          # repo_token: ${{ secrets.SCORECARD_TOKEN }}
+          publish_results: true
+
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@v4
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      - name: "Upload to code-scanning dashboard"
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: results.sarif