e2e: Add Kubernetes v1.28.0 to conformance tests

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

.github/workflows/e2e-arm64.yaml

@@ -17,7 +17,7 @@ jobs:
       matrix:
         # Keep this list up-to-date with https://endoflife.date/kubernetes
         # Check which versions are available on DockerHub with 'crane ls kindest/node'
-        KUBERNETES_VERSION: [ 1.25.8, 1.26.3, 1.27.3 ]
+        KUBERNETES_VERSION: [ 1.25.11, 1.26.6, 1.27.3, 1.28.0 ]
     steps:
       - name: Checkout
         uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3

.github/workflows/e2e-bootstrap.yaml

@@ -32,8 +32,8 @@ jobs:
           cluster_name: kind
           # The versions below should target the newest Kubernetes version
           # Keep this up-to-date with https://endoflife.date/kubernetes
-          node_image: kindest/node:v1.27.3@sha256:3966ac761ae0136263ffdb6cfd4db23ef8a83cba8a463690e98317add2c9ba72
-          kubectl_version: v1.27.3
+          node_image: kindest/node:v1.28.0@sha256:9f3ff58f19dcf1a0611d11e8ac989fdb30a28f40f236f59f0bea31fb956ccf5c
+          kubectl_version: v1.28.0
       - name: Setup Kustomize
         uses: fluxcd/pkg/actions/kustomize@main
       - name: Build

.github/workflows/e2e.yaml

@@ -37,8 +37,8 @@ jobs:
           config: .github/kind/config.yaml # disable KIND-net
           # The versions below should target the newest Kubernetes version
           # Keep this up-to-date with https://endoflife.date/kubernetes
-          node_image: kindest/node:v1.27.3@sha256:3966ac761ae0136263ffdb6cfd4db23ef8a83cba8a463690e98317add2c9ba72
-          kubectl_version: v1.27.3
+          node_image: kindest/node:v1.28.0@sha256:9f3ff58f19dcf1a0611d11e8ac989fdb30a28f40f236f59f0bea31fb956ccf5c
+          kubectl_version: v1.28.0
       - name: Setup Calico for network policy
         run: |
           kubectl apply -f https://docs.projectcalico.org/v3.25/manifests/calico.yaml