Add test

.github/workflows/test.yaml

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+name: Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+  workflow_dispatch:
+
+jobs:
+  test:
+    # https://docs.github.com/en/actions/using-jobs/using-concurrency
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}-${{ matrix.kube-version }}
+      cancel-in-progress: true
+
+    # https://docs.github.com/en/actions/using-jobs/using-a-matrix-for-your-jobs
+    strategy:
+      fail-fast: false
+      matrix:
+        kube-release:
+          - 1.23
+
+    continue-on-error: false
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install conntrack
+        run: |
+          sudo apt update
+          sudo apt install -y conntrack
+
+      # Install Kubernetes use apt source with specified version
+      - name: Install Kubernetes
+        run: |
+          sudo snap install kubelet --channel=${{ matrix.kube-release }}/stable --classic
+          sudo snap install kubectl --channel=${{ matrix.kube-release }}/stable --classic
+          sudo snap install kubeadm --channel=${{ matrix.kube-release }}/stable --classic
+          wget -O crictl-linux-amd64.tar.gz https://github.com/kubernetes-sigs/cri-tools/releases/download/v${{ matrix.kube-release }}.0/crictl-v${{ matrix.kube-release }}.0-linux-amd64.tar.gz && \
+            sudo tar zxvf crictl-linux-amd64.tar.gz -C /usr/local/bin && \
+            rm -f crictl-linux-amd64.tar.gz
+
+      - name: Swap off
+        run: |
+          sudo swapoff -a
+          sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
+
+      - name: Start Kubelet
+        run: |
+          sudo mkdir /etc/systemd/system/kubelet.service.d/
+          sudo cp ./test/etc/systemd/system/kubelet.service.d/10-kubeadm.conf /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
+          sudo sed -i "s#/usr/bin#/snap/bin#" /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
+          sudo cp ./test/etc/systemd/system/kubelet.service /etc/systemd/system/kubelet.service
+          sudo cp ./test/var/lib/kubelet/kubeadm-flags.env /var/lib/kubelet/kubeadm-flags.env
+          sudo cp ./test/var/lib/kubelet/config.yaml /var/lib/kubelet/config.yaml
+          sudo systemctl daemon-reload
+          sudo systemctl enable kubelet --now
+          sleep 2
+          sudo systemctl status kubelet || journalctl -xe -u kubelet || true
+
+      - name: Initialize Kubernetes
+        run: |
+          sudo kubeadm init || {
+            journalctl -xeu kubelet
+            exit 1
+          }
+
+      - name: Setup kubeconfig
+        run: |
+          mkdir -p $HOME/.kube
+          sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
+          sudo chown $(id -u):$(id -g) $HOME/.kube/config
+      
+      - name: Get pods
+        run: |
+          kubectl get pods -o wide --all-namespaces
+      
+      - name: Get nodes
+        run: |
+          kubectl get nodes -o wide

test/etc/systemd/system/kubelet.service

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+[Unit]
+Description=kubelet: The Kubernetes Node Agent
+Documentation=https://kubernetes.io/docs/home/
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+ExecStart=/usr/bin/kubelet
+Restart=always
+StartLimitInterval=0
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target

test/etc/systemd/system/kubelet.service.d/10-kubeadm.conf

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+# Note: This dropin only works with kubeadm and kubelet v1.11+
+[Service]
+Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
+Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
+# This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically
+EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
+# This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use
+# the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.
+EnvironmentFile=-/etc/default/kubelet
+ExecStart=
+ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS

test/var/lib/kubelet/config.yaml

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+apiVersion: kubelet.config.k8s.io/v1beta1
+kind: KubeletConfiguration

test/var/lib/kubelet/kubeadm-flags.env

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+KUBELET_KUBEADM_ARGS=""