Add Digger to ecosystem

docs/website/content/integrations/digger.md

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+---
+title: Digger
+subtitle: GitOps for Terraform
+labels:
+  layer: cicd
+  category: Infrastructure as Code
+software:
+- terraform
+inventors:
+- diggerhq
+code:
+- https://github.com/diggerhq/digger
+tutorials:
+- https://docs.digger.dev/readme/introduction
+- https://docs.digger.dev/digger-api/rbac-via-opa-guide
+- https://docs.digger.dev/configuration/using-opa-conftest
+---
+Digger is an open-source CI/CD orchestrator for Terraform. It provides role-based access control via OPA, and also integrates Conftest to check Terraform plan output against policies.

docs/website/content/organizations/diggerhq.md

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+---
+link: https://github.com/diggerhq
+title: DiggerHQ
+---