Add Scorecard GHA (#1973)

Fixes #1972

This adds the Scorecard GitHub Action to monitor the project's
supply-chain security posture.

Signed-off-by: Pedro Kaj Kjellerup Nacht <pnacht@google.com>

diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
new file mode 100644 (file)
index 0000000..3dd8e71
--- /dev/null
+++ b/.github/workflows/scorecard.yml
@@ -0,0 +1,65 @@
+# This workflow uses actions that are not certified by GitHub. They are provided
+# by a third-party and are governed by separate terms of service, privacy
+# policy, and support documentation.
+
+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: '42 8 * * 0'
+  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 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@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@08b4669551908b1024bb425080c797723083c031 # v2.2.0
+        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
+          # To create the PAT, follow the steps in
+          # https://github.com/ossf/scorecard-action#authentication-with-fine-grained-pat-optional
+          # repo_token: ${{ secrets.SCORECARD_TOKEN }}
+
+          # - 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@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
+        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@04daf014b50eaf774287bf3f0f1869d4b4c4b913 # v2.21.7
+        with:
+          sarif_file: results.sarif