feat: discover current k8s versions using DescribeClusterVersions api (#2143)

Author: ndbaker1

.github/workflows/ci-manual.yaml

@@ -32,7 +32,6 @@ on:
         type: string
       k8s_versions:
         description: 'Kubernetes Versions (comma-separated, e.g., 1.29,1.30)'
-        default: "1.24,1.25,1.26,1.27,1.28,1.29,1.30,1.31"
         required: false
         type: string
       build_arguments:

.github/workflows/ci.yaml

@@ -23,7 +23,6 @@ on:
         type: string
       k8s_versions:
         description: 'Kubernetes Versions (comma-separated, e.g., 1.29,1.30)'
-        default: "1.24,1.25,1.26,1.27,1.28,1.29,1.30,1.31"
         required: false
         type: string
       build_arguments:
@@ -45,8 +44,12 @@ jobs:
     - id: variables
       run: |
         echo 'ci_step_name_prefix=CI:' >> $GITHUB_OUTPUT
-        echo "kubernetes_versions=$(jq -Rn --arg input '${{ inputs.k8s_versions }}' '($input | split(","))' | jq -c .)" >> $GITHUB_OUTPUT
         echo "os_distros=$(jq -Rn --arg input '${{ inputs.os_distros }}' '($input | split(","))' | jq -c .)" >> $GITHUB_OUTPUT
+        if [ -z "${{ inputs.k8s_versions }}" ]; then
+          echo "kubernetes_versions=$(aws eks describe-cluster-versions | jq -c '.clusterVersions | map(.clusterVersion)')" >> $GITHUB_OUTPUT
+        else
+          echo "kubernetes_versions=$(jq -Rn --arg input '${{ inputs.k8s_versions }}' '($input | split(","))' | jq -c .)" >> $GITHUB_OUTPUT
+        fi
   kubernetes-versions:
     runs-on: ubuntu-latest
     name: ${{ matrix.k8s_version }} / ${{ matrix.os_distro }}