docs: refactor

README.md

@@ -1,64 +1,17 @@
 # cosign-sign-push-action
 
-## 1. Features
+## Features
 
 - Based on `cosign` local keys.
 - Signs images and pushes them to a container registry.
 
-## 2. How to Use
+## Topics
 
-### 2.1. Cosign Local Keys
+- [Key Generation](./docs/key-management.md)
+- [Configure Policy controller in kubernetes cluster](./docs/policy-controller.md)
+- [Create Policies](./docs/policy.md)
 
-#### Workflow
-
-1. Generate a password for the private key.
-2. Generate a key pair.
-3. Store the private key and password in GitHub Actions Secrets.
-
-#### Generate Key Pair
-
-You can generate keys using:
-
-1. [Official Binary](https://docs.sigstore.dev/system_config/installation/)
-
-    ```sh
-    COSIGN_PASSWORD=<your_private_key_password> cosign generate-key-pair
-    ```
-
-2. [Docker Image by VMware](https://hub.docker.com/r/bitnami/cosign/)
-
-    ```sh
-    docker run --rm -it \
-    -e COSIGN_PASSWORD=<your_private_key_password> \
-    -v "$(pwd):/keys" \
-    -w /keys \
-    bitnami/cosign:latest \
-    generate-key-pair
-    ```
-
-Default GitHub Action Secrets for keys:
-
-- `COSIGN_PASSWORD`: Password for the private key.
-- `COSIGN_PUBLIC_KEY`: Content of the file `cosign.pub`.
-- `COSIGN_PRIVATE_KEY`: Content of the file `cosign.key`.
-
-You can generate and store keys directly in GitHub Actions Secrets with the command:
-
-```bash
-GITHUB_TOKEN=xxx cosign generate-key-pair github://dodopizza/app
-```
-
-**Note:** You can't export the public key with `cosign` from GitHub Action Secrets.
-
-### 2.2. GitHub Action
-
-#### Workflow
-
-1. Set up `cosign` (e.g., `sigstore/cosign-installer`).
-2. Log in to the container registry (e.g., `docker/login-action`).
-3. Sign the image using this action.
-
-#### Input Variables
+## Input Variables
 
 | Variable             | Required | Description                                                                                                               |
 | -------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------- |
@@ -67,73 +20,7 @@ GITHUB_TOKEN=xxx cosign generate-key-pair github://dodopizza/app
 | `cosign-private-key` | Yes      | Cosign private key used for signing container images.                                                                     |
 | `cosign-password`    | Yes      | Password for the Cosign private key.                                                                                      |
 
-### 2.3. Configure Kubernetes Cluster
-
-#### Workflow
-
-1. Add the Helm chart, configure values, and deploy the Policy Controller.
-2. Create policies.
-
-#### Helm Chart
-
-1. Add the Sigstore Helm repository:
-
-    ```sh
-    helm repo add sigstore https://sigstore.github.io/helm-charts
-    ```
-
-2. Update your local Helm chart repository cache:
-
-    ```sh
-    helm repo update
-    ```
-
-3. Install the `policy-controller` chart from the Sigstore repository:
-
-    ```sh
-    helm install policy-controller sigstore/policy-controller
-    ```
-
-    Using a `values.yaml` file:
-
-    ```sh
-    helm install policy-controller sigstore/policy-controller -f values.yaml
-    ```
-
-Helm chart documentation: [artifacthub.io/packages/helm/sigstore/policy-controller](https://artifacthub.io/packages/helm/sigstore/policy-controller)
-
-#### Create Policies
-
-Sample policy:
-
-```yaml
-apiVersion: policy.sigstore.dev/v1alpha1
-kind: ClusterImagePolicy
-metadata:
-  name: custom-key-attestation-sbom-spdxjson
-spec:
-  images:
-  - glob: "**"
-  authorities:
-  - name: custom-key
-    key:
-      data: |
-        -----BEGIN PUBLIC KEY-----
-        MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEOc6HkISHzVdUbtUsdjYtPuyPYBeg
-        4FCemyVurIM4KEORQk4OAu8ZNwxvGSoY3eAabYaFIPPQ8ROAjrbdPwNdJw==
-        -----END PUBLIC KEY-----
-    attestations:
-    - name: must-have-spdxjson
-      predicateType: https://spdx.dev/Document
-      policy:
-        type: cue
-        data: |
-          predicateType: "https://spdx.dev/Document"
-```
-
-For more documentation and sample policies, refer to: [docs.sigstore.dev/policy-controller/sample-policies](https://docs.sigstore.dev/policy-controller/sample-policies/)
-
-## 3. Usage example:
+## Usage example:
 
 ```yaml
 name: Build and sign image
@@ -212,4 +99,3 @@ jobs:
 
 - [Cosign Documentation](https://docs.sigstore.dev/)
 - [Cosign Installer GitHub](https://github.com/sigstore/cosign-installer/)
-- [Helm Chart for Policy Controller](https://artifacthub.io/packages/helm/sigstore/policy-controller)