website: Add database configuration guide for KFP operation guide

Signed-off-by: kaikaila <lyk2772@126.com>

Author: kaikaila

content/en/docs/components/pipelines/operator-guides/configure-database.md

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++++
+title = "Database Configuration"
+description = ""
+weight = 4
++++
+
+{{% kfp-v2-keywords %}}
+
+Kubeflow Pipelines (KFP) uses a relational database to store pipeline definitions, run history, and other metadata. The API server is the main component that interacts with the database.
+
+By default, KFP deploys with MySQL. PostgreSQL is also available as an experimental option.
+
+## MySQL (Default)
+
+MySQL is the default database backend for KFP. It is automatically configured when you deploy KFP using the standard kustomize manifests. No additional database configuration is needed.
+
+To deploy KFP with MySQL using the platform-agnostic overlay:
+
+```bash
+export PIPELINE_VERSION={{% pipelines/latest-version %}}
+kubectl apply -k "github.com/kubeflow/pipelines/manifests/kustomize/cluster-scoped-resources?ref=$PIPELINE_VERSION"
+kubectl wait --for condition=established --timeout=60s crd/applications.app.k8s.io
+kubectl apply -k "github.com/kubeflow/pipelines/manifests/kustomize/env/platform-agnostic?ref=$PIPELINE_VERSION"
+```
+
+For full installation instructions, see the [Installation](/docs/components/pipelines/operator-guides/installation/) guide.
+
+## PostgreSQL (Experimental)
+
+{{% alert title="Warning" color="warning" %}}
+PostgreSQL support is experimental and not yet included in a stable release. It is expected to be available starting from v3.0.0.
+{{% /alert %}}
+
+KFP provides a dedicated kustomize overlay for PostgreSQL-based deployments at `manifests/kustomize/env/platform-agnostic-postgresql`.
+
+### Deploying with PostgreSQL After Official Release
+
+Once PostgreSQL support is included in a stable release (v3.0.0+), the base images will have PostgreSQL support built in. You can deploy KFP with PostgreSQL using the `platform-agnostic-postgresql` overlay:
+
+```bash
+export PIPELINE_VERSION=<version-with-postgresql-support>
+kubectl apply -k "github.com/kubeflow/pipelines/manifests/kustomize/cluster-scoped-resources?ref=$PIPELINE_VERSION"
+kubectl wait --for condition=established --timeout=60s crd/applications.app.k8s.io
+kubectl apply -k "github.com/kubeflow/pipelines/manifests/kustomize/env/platform-agnostic-postgresql?ref=$PIPELINE_VERSION"
+```
+
+### Early Access: Building from Source
+
+The current stable release images do not include PostgreSQL support. If you want to try PostgreSQL before the official release, you need to build images from the `master` branch of the [kubeflow/pipelines](https://github.com/kubeflow/pipelines) repository.
+
+#### Build the Required Images
+
+Clone the repository and build the images:
+
+```bash
+cd backend
+make image_api_server
+make image_cache
+```
+
+#### Push to Your Registry
+
+Tag and push the built images to your own container registry:
+
+```bash
+docker tag gcr.io/ml-pipeline/api-server:latest your-registry/kfp-api-server:your-tag
+docker tag gcr.io/ml-pipeline/cache-server:latest your-registry/kfp-cache-server:your-tag
+docker push your-registry/kfp-api-server:your-tag
+docker push your-registry/kfp-cache-server:your-tag
+```
+
+#### Create a Custom Overlay
+
+Create a kustomize overlay that references the `platform-agnostic-postgresql` base and overrides the image references with your custom-built images:
+
+```bash
+mkdir -p my-postgresql-overlay
+cd my-postgresql-overlay
+```
+
+Create a `kustomization.yaml`:
+
+```yaml
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../manifests/kustomize/env/platform-agnostic-postgresql
+
+images:
+  - name: ghcr.io/kubeflow/kfp-api-server
+    newName: your-registry/kfp-api-server
+    newTag: your-tag
+  - name: ghcr.io/kubeflow/kfp-cache-server
+    newName: your-registry/kfp-cache-server
+    newTag: your-tag
+```
+
+#### Deploy
+
+Apply your custom overlay:
+
+```bash
+kubectl apply -k my-postgresql-overlay
+```