Release Quickstart Script Missing Important Updates

[danehans]

The hack/release-quickstart.sh script contains the following bugs:

• Release: Updates EPP tag sed for quickstart script #1035 generalized the sed command to manage the tag for the EPP image. However, the previous sed should be used when RC is set and the current logic should be used when RC is unset.
• A lora-syncer tagged image is created when a release is cut. Still, the vLLM CPU, GPU and Sim manifests are not updated to set the image tag like it does for the EPP image tag in the same manifests. Here's an example of the e-extension/blob/v0.4.0/config/manifests/vllm/gpu-deployment.yaml#L158 that still uses the main tag.
• The VERSION env var in site-src/guides/index.md is not updated.
• All the references to main resources should use the tagged branch instead, i.e. kubectl apply -f https://github.com/kubernetes-sigs/gateway-api-inference-extension/raw/main/config/manifests/vllm/gpu-deployment.yaml should be kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/gateway-api-inference-extension/refs/tags/$VERSION/config/manifests/vllm/gpu-deployment.yaml. This ensures the entire quickstart guide algins with a release.

[danehans]

FYI @kfswain @nirrozenbaum I ran into these issues cutting the v0.4.0 release.

xref: #1043

[nirrozenbaum]

• the version in Readme under status section is not updated

[Ruoyu-y]

Hi, I'd like to help with this. After checking the code, i found that only the second issue hasn't been resolved. Adding a simple patch for that #1080 .

[Ruoyu-y]

/assign