Add OSSF scorecard workflow

See https://scorecard.dev/

Signed-off-by: Jan Dubois <[email protected]>

.github/workflows/scorecard.yml

@@ -0,0 +1,65 @@
+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:
+  # To guarantee Maintained check is occasionally updated. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
+  schedule:
+  - cron: '23 13 * * 4'
+  push:
+    branches:
+    - master
+  workflow_dispatch:
+
+# 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 code-scanning dashboard.
+      security-events: write
+      # Needed to publish results and get a badge (see publish_results below).
+      id-token: write
+
+    steps:
+    - name: "Checkout code"
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
+      with:
+        persist-credentials: false
+
+    - name: "Run analysis"
+      uses: ossf/scorecard-action@0864cf19026789058feabb7e87baa5f140aac736  # 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 }}
+
+        # Public repositories:
+        #   - Publish results to OpenSSF REST API for easy access by consumers
+        #   - Allows the repository to include the Scorecard badge.
+        #   - See https://github.com/ossf/scorecard-action#publishing-results.
+        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.
+    - name: "Upload artifact"
+      uses: actions/upload-artifact@97a0fba1372883ab732affbe8f94b823f91727db  # v3.pre.node20
+      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@v3
+      with:
+        sarif_file: results.sarif