ci: add OpenSSF scorecard analysis

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

.github/workflows/analysis-scorecard.yaml

+name: OpenSSF Scorecard
+
+on:
+  branch_protection_rule:
+  push:
+    branches: [ main ]
+  schedule:
+    - cron: '30 0 * * 5'
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    permissions:
+      actions: read
+      contents: read
+      id-token: write
+      security-events: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
+        with:
+          persist-credentials: false
+
+      - name: Run analysis
+        uses: ossf/scorecard-action@80e868c13c90f172d68d1f4501dee99e2479f7af # v2.1.3
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          publish_results: true
+
+      - name: Upload results as artifact
+        uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
+        with:
+          name: OpenSSF Scorecard results
+          path: results.sarif
+          retention-days: 5
+
+      - name: Upload results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@8662eabe0e9f338a07350b7fd050732745f93848 # v2.3.1
+        with:
+          sarif_file: results.sarif

README.md

 # dex - A federated OpenID Connect provider
 
 ![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/dexidp/dex/ci.yaml?style=flat-square&branch=master)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/dexidp/dex/badge?style=flat-square)](https://api.securityscorecards.dev/projects/github.com/dexidp/dex)
 [![Go Report Card](https://goreportcard.com/badge/github.com/dexidp/dex?style=flat-square)](https://goreportcard.com/report/github.com/dexidp/dex)
 [![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod&style=flat-square)](https://gitpod.io/#https://github.com/dexidp/dex)