chore: add openssf to repo

Author: sthulb

.github/workflows/openssf_scorecard.yml

@@ -0,0 +1,48 @@
+name: Scorecard supply-chain security
+on:
+  # For Branch-Protection check. Only the default branch is supported. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
+  branch_protection_rule:
+  schedule:
+    - cron: "0 9 * * *"
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    # environment: scorecard
+    permissions:
+      security-events: write  # update code-scanning dashboard
+      id-token: write  # confirm org+repo identity before publish results
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@62b2cac7ed8198b15735ed49ab1e5cf35480ba46 # v2.4.0
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          publish_results: true  # publish to OSSF Scorecard REST API
+          # repo_token: ${{ secrets.SCORECARD_TOKEN }}  # read-only fine-grained token to read branch protection settings
+
+      - name: "Upload results"
+        uses: actions/upload-artifact@6f51ac03b9356f520e9adb1b1b7802705f340c2b # v4.5.0
+        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@df409f7d9260372bd5f19e5b04e83cb3c43714ae # v3.27.9
+        with:
+          sarif_file: results.sarif