Confluent Schema Registry action first release

First release of the schema registry action! 🎉

Usage:

Add a schema.yml mapping schemas to subjects for validation

---
schemas:
  - subject: subject1-key
     file: schema0.avsc
# - ...

A Github Actions specification in the workflow folder (.github/workflows/*.yml)

uses: divloic/ccloud-registry-action@v0.0.1
with:
  avro-files-path: src/main/avro/
  avro-subject-yaml: schemas.yaml
  schema-registry-url: ${{ secrets.SCHEMA_REGISTRY_URL }}
  schema-registry-api-key: ${{ secrets.SCHEMA_REGISTRY_API_KEY }}
  schema-registry-secret-key: ${{ secrets.SCHEMA_REGISTRY_SECRET_KEY }}