docs: add github action policy testing automation

Signed-off-by: yangci <[email protected]>

docs/website/content/integrations/github-action-opa-rego-test.md

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+---
+title: GitHub Action for OPA Rego Test
+subtitle: GitHub Action to automate testing OPA Rego policies
+labels:
+  category: library
+  type: GitHub Action
+inventors:
+- masterpoint
+code:
+- https://github.com/masterpointio/github-action-opa-rego-test
+tutorials:
+- https://github.com/masterpointio/github-action-opa-rego-test/blob/main/README.md
+docs_features:
+  policy-testing:
+    note: |
+      [GitHub Action for OPA Rego Policy Tests](docs/website/content/integrations/rego-test-assertions.md) automates testing for your OPA (Open Policy Agent) Rego policies, generates a report with coverage information, and posts the test results as a comment on your pull requests, making it easy for your team to review and approve policies.
+---
+
+[GitHub Action for OPA Rego Policy Tests](docs/website/content/integrations/rego-test-assertions.md) by [Masterpoint](https://masterpoint.io/) is used to automate testing for your OPA (Open Policy Agent) Rego policies, generates a report with coverage information, and posts the test results as a comment on your pull requests, making it easy for your team to review and approve policies.
+
+Use this to test your OPA Rego files for [Spacelift policies](https://docs.spacelift.io/concepts/policy), [Kubernetes Admission Controller policies](https://www.openpolicyagent.org/docs/latest/kubernetes-introduction/), [Docker authorization policies](https://www.openpolicyagent.org/docs/latest/docker-authorization/), or any other use case that uses [Open Policy Agent's policy language Rego](https://www.openpolicyagent.org/docs/latest/). This Action also updates PR comments with the test results in place to prevent duplication.

docs/website/content/organizations/masterpoint.md

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+---
+link: https://masterpoint.io
+title: Masterpoint Consulting 
+---