Create Scorecards workflow

This action allows us to improve visibility over supply chain security.

.github/workflows/scorecards-analysis.yml

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+name: Scorecards supply-chain security
+on:
+  branch_protection_rule: {}
+  schedule:
+    - cron: '30 15 * * 6'
+  push:
+    branches: [ main ]
+
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecards analysis
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      actions: read
+      contents: read
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@c8416b0b2bf627c349ca92fc8e3de51a64b005cf
+        with:
+          results_file: results.sarif
+          results_format: sarif              
+          repo_token: ${{ secrets.SCORECARD_READ_TOKEN }}
+          publish_results: true
+
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@82c141cc518b40d92cc801eee768e7aafc9c2fa2 
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard.
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@5f532563584d71fdef14ee64d17bafb34f751ce5 
+        with:
+          sarif_file: results.sarif