feat: epp standalone helm chart included in release to docker

[capri-xiyue]

What type of PR is this?

/kind feature

What this PR does / why we need it:
Include epp-standalone helm chart in release. Have oci://us-central1-docker.pkg.dev/k8s-staging-images/gateway-api-inference-extension/charts/epp-standalone aviailable.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[netlify]

✅ Deploy Preview for gateway-api-inference-extension ready!

Name	Link
🔨 Latest commit	739098a
🔍 Latest deploy log	https://app.netlify.com/projects/gateway-api-inference-extension/deploys/69695f62682be8000883f084
😎 Deploy Preview	https://deploy-preview-2148--gateway-api-inference-extension.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[capri-xiyue]

assign @kfswain
assign @ahg-g

[capri-xiyue]

My goal is to have oci://us-central1-docker.pkg.dev/k8s-staging-images/gateway-api-inference-extension/charts/epp-standalone aviailable. Let me know whether this PR is enough or not.

[ahg-g]

you need to add it to cloud build as well: https://github.com/kubernetes-sigs/gateway-api-inference-extension/blob/main/cloudbuild.yaml#L24

[capri-xiyue]

you need to add it to cloud build as well: https://github.com/kubernetes-sigs/gateway-api-inference-extension/blob/main/cloudbuild.yaml#L24

updated

[ahg-g]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, capri-xiyue

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [ahg-g]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment