docs: add chains integration

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

Author: osamamagdy

content/en/v3/develop/supply-chain-security/_index.md

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+---
+title: Supply Chain Security
+linktitle: Supply Chain Security
+type: docs
+description: Securing Your Supply Chain in Jenkins X
+weight: 200
+---
+
+For a CI/CD system like Jenkins X to be an all-in-one solution, it's an essential part to secure supply chain of our users.
+We've improved support for generating [SBOMs](https://jenkins-x.io/blog/2022/07/24/intro-to-sbom/) and signing generated artifacts so that you can
+
+* easily generate sboms for released artifacts [in the same approach Jenkins X does](https://jenkins-x.io/community/maintainer_guide/supply-chain-security/) by just modifying the files in your `.lighthouse/jenkins-x` folder
+* [sign tekton artifacts using chains](chains/) to sign any [TaskRun](https://tekton.dev/docs/pipelines/taskruns/) in your pipelines.

content/en/v3/develop/supply-chain-security/chains.md

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+---
+title: chains
+linktitle: chains
+type: docs
+description: Integration with Tekton Chains
+weight: 400
+---
+Securing your supply chain is not just about verifying the dependencies and eliminating vulnerabilities. It also includes ensuring that the building process was not [compromised during operation](https://slsa.dev/spec/v0.1/threats#d-compromise-build-process).
+Jenkins X can be integrated with [Tekton Chains](https://tekton.dev/docs/chains/) to sign [TaskRuns](https://tekton.dev/docs/pipelines/taskruns/) and verifying the it was not tampered.
+
+To add it to your cluster, you should do the following:
+
+1. First go to the cluster git repository where you want to add chains. It is integrated in the JX version stream from a [Helm Chart developed by chainguard](https://github.com/chainguard-dev/tekton-helm-charts/tree/main/charts/tekton-chains).
+
+2. Add this line to the `./helmfile.yaml` of the cluster repo
+
+    ```yaml
+    helmfiles:
+    - path: helmfiles/tekton-chains/helmfile.yaml
+    ```
+
+3. Add this line to the `./helmfile.yaml` of the cluster repo
+
+    ```yaml
+    helmfiles:
+    - path: helmfiles/tekton-chains/helmfile.yaml
+    ```
+
+4. Create a `./helmfiles/tekton-chains/helmfile.yaml` file with the following configurations
+
+    ```yaml
+    filepath: ""
+    environments:
+      default:
+        values:
+        - jx-values.yaml
+    namespace: tekton-chains
+    repositories:
+    - name: tekton
+      url: https://chainguard-dev.github.io/tekton-helm-charts/
+    releases:
+    - chart: tekton/tekton-chains
+      version: 0.2.3
+      name: tekton-chains
+      values:
+      - ../../versionStream/charts/chainguard-dev/tekton-chains/values.yaml.gotmpl
+      - jx-values.yaml
+    templates: {}
+    renderedvalues: {}
+    ```
+
+    This will update the `versionStream` to include default values from the [jx3-versions](https://github.com/jenkins-x/jx3-versions/tree/master/charts/chainguard-dev/tekton-chains) repository.
+
+5. Create a  `./helmfiles/tekton-chains/jx-values.yaml` to include additional configurations to suit your use.
+
+6. As a final step you need to generate your own encrypted x509 keypair and save it as a Kubernetes secret, install [cosign](https://github.com/sigstore/cosign) and run the following:
+
+    ```bash
+    cosign generate-key-pair k8s://tekton-chains/signing-secrets
+    #The secret was created by the helm chart but with empty data
+    ```
+
+## Extra Configurations
+
+In its default mode of operation, Chains works by observing all `TaskRuns` executions in your cluster. When `TaskRuns` complete, Chains takes a snapshot of them. Chains then converts this snapshot to one or more standard payload formats, signs them and stores them as annotations to `TaskRun` itself.
+
+## Verifying the signature
+
+- To verify the signature of the last `TaskRun`, you can run the following
+
+    ```bash
+    export TASKRUN_UID=$(tkn tr describe --last -o  jsonpath='{.metadata.uid}')
+    tkn tr describe --last -o jsonpath="{.metadata.annotations.chains\.tekton\.dev/signature-taskrun-$TASKRUN_UID}" > signature
+    tkn tr describe --last -o jsonpath="{.metadata.annotations.chains\.tekton\.dev/payload-taskrun-$TASKRUN_UID}" | base64 -d > payload
+    ```