CI: README: Add OpenSSF scorecard badge

.github/workflows/scorecard-analysis.yml

@@ -0,0 +1,59 @@
+name: Scorecard analysis workflow
+on:
+  push:
+    # Only the default branch is supported.
+    branches:
+    - main
+  schedule:
+    # Daily
+    - cron: '30 1 * * *'
+
+# based on https://github.com/ossf/scorecard/blob/main/.github/workflows/scorecard-analysis.yml
+
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    permissions:
+      # Needed for Code scanning upload
+      security-events: write
+      # Needed for GitHub OIDC token if publish_results is true
+      id-token: write
+
+    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
+          # Scorecard team runs a weekly scan of public GitHub repos,
+          # see https://github.com/ossf/scorecard#public-data.
+          # Setting `publish_results: true` helps us scale by leveraging your workflow to
+          # extract the results instead of relying on our own infrastructure to run scans.
+          # And it's free for you!
+          publish_results: true
+
+      # Upload the results as artifacts (optional). Commenting out will disable
+      # uploads of run results in SARIF format to the repository Actions tab.
+      # https://docs.github.com/en/actions/advanced-guides/storing-workflow-data-as-artifacts
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4.6.0
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard (optional).
+      # Commenting out will disable upload of results to your repo's Code Scanning dashboard
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@b6a472f63d85b9c78a3ac5e89422239fc15e9b3c # v3.28.1
+        with:
+          sarif_file: results.sarif
+

README.md

@@ -2,6 +2,8 @@
 
 Nebraska is an update manager for [Flatcar Container Linux](https://www.flatcar.org/).
 
+[![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/flatcar/nebraska/badge)](https://scorecard.dev/viewer/?uri=github.com/flatcar/nebraska)
+
 ## Overview
 
 Nebraska offers an easy way to monitor and manage the rollout of updates to applications that use