Enable OpenSSF Scorecard Action

Hi, I'd like to suggest the adoption of the OpenSSF Scorecard Action.

The scorecard action runs the OpenSSF Scorecard checks on the repository often to provide feedbacks on how to improve (on the security dashboard) and transparency for the users about the current security posture (shown in the badge).

It is also a good way to keep track of new security practices and to provide users easy information about it.

See more about scorecard at [OpenSSF Scorecard](https://github.com/ossf/scorecard) and the [Show off your security score](https://openssf.org/blog/2022/09/08/show-off-your-security-score-announcing-scorecards-badges/)

PiperOrigin-RevId: 568644059

.github/workflows/scorecard.yml

@@ -0,0 +1,60 @@
+# 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: '20 5 * * 2'
+  push:
+    branches: [ "main" ]
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write # to upload the results to code-scanning dashboard
+      id-token: write # to publish results and get a badge
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # v3.1.0
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@e38b1902ae4f44df626f11ba0734b14fb91f8f86 # v2.1.2
+        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
+          # 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 }}
+
+          # Allows the repository to include the Scorecard badge.
+          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@3cea5372237819ed00197afe530f5a7ea3e805c8 # v3.1.0
+        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@17573ee1cc1b9d061760f3a006fc4aac4f944fd5 # v2.2.4
+        with:
+          sarif_file: results.sarif

README.md

@@ -1,6 +1,8 @@
 Protocol Buffers - Google's data interchange format
 ===================================================
 
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/protocolbuffers/protobuf/badge)](https://securityscorecards.dev/viewer/?uri=github.com/protocolbuffers/protobuf)
+
 Copyright 2023 Google LLC
 
 Overview