ci: expand k8s support testing to 1.28+

Signed-off-by: Erez Freiberger <enoodle@gmail.com>

Author: enoodle

.github/workflows/on-release.yaml

@@ -86,7 +86,7 @@ jobs:
           # Update with each release to match the current k8s support window.
           # Verify patch versions at https://github.com/kubernetes-sigs/kind/releases
           # DRA feature config is only relevant for v1.32 (v1beta1) and v1.33 (v1beta2).
-          # v1.34+ has DRA GA; v1.31 predates the DRA beta.
+          # v1.34+ has DRA GA; v1.31 and earlier predate the DRA beta.
           - k8s_version: v1.36.0
             feature_config: default
           - k8s_version: v1.35.0
@@ -103,6 +103,12 @@ jobs:
             feature_config: dra-enabled
           - k8s_version: v1.31.6
             feature_config: default
+          - k8s_version: v1.30.4
+            feature_config: default
+          - k8s_version: v1.29.8
+            feature_config: default
+          - k8s_version: v1.28.13
+            feature_config: default
     steps:
       - name: Checkout code
         uses: actions/checkout@v6

SUPPORT.md

@@ -32,6 +32,21 @@ The following versions are currently supported.
 
 > **Note on Versioning:** The strict "Even numbers are LTS" policy begins with `v0.12`. The versions listed above (`v0.9`, `v0.6`, `v0.4`) are supported as transitional LTS releases.
 
+## Kubernetes Support Matrix
+
+The release workflow matrix below is the current KAI-to-Kubernetes support window.
+Historical support additions are listed after the table.
+
+| KAI Release Line | Kubernetes Versions Validated | Notes |
+| :--- | :--- | :--- |
+| `v0.14.x` and `v0.15.x` tags | `v1.31.6`, `v1.32.3` (`default`, `dra-enabled`), `v1.33.4` (`default`, `dra-enabled`), `v1.34.0`, `v1.35.0` | This matrix landed in `5f09d6dc` and is present through tag `v0.15.2`. |
+| `main` / next unreleased line | Same as above plus `v1.36.0` | `5743bccc` added `v1.36.0` to the release workflow. |
+
+### Historical Support Notes
+
+* `v0.13.x` added version-aware DRA handling, including the `1.32`/`1.33` runtime-config split and DRA tracker gating (`62391cc4`, `032d7641`, `2f429935`).
+* `v0.9.x`, `v0.6.x`, and `v0.4.x` explicitly added `v1.34` DRA support (`281f4269`, `2279b43d`, `95c963e2`).
+
 ## Reporting Bugs
 
 If you encounter a bug, please [open an issue](https://github.com/kai-scheduler/KAI-scheduler/issues) on GitHub.