add kubeconfig

Author: springhack

.github/workflows/kubeconfig.yml

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+---
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - .github/workflows/kubeconfig.yml
+      - kubeconfig/**
+jobs:
+  kubeconfig:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: Login
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Setup Docker
+        uses: docker/setup-buildx-action@v1
+      - name: Build Docker
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          context: ${{ github.job }}
+          file: ${{ github.job }}/Dockerfile
+          platforms: linux/amd64
+          tags: ${{ secrets.DOCKER_HUB_USERNAME }}/${{ github.job }}:latest
+          cache-from: type=registry,ref=${{ secrets.DOCKER_HUB_USERNAME }}/${{ github.job }}:buildcache
+          cache-to: type=registry,ref=${{ secrets.DOCKER_HUB_USERNAME }}/${{ github.job }}:buildcache,mode=max
+      - name: Push Docker Description
+        uses: peter-evans/dockerhub-description@v2
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_PASSWORD }}
+          repository: ${{ secrets.DOCKER_HUB_USERNAME }}/${{ github.job }}
+          short-description: '使用参考 README，信息参考：https://www.dosk.win/'

kubeconfig/Dockerfile

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+FROM bitnami/kubectl:latest
+COPY gen-kubeconfig.sh /usr/local/bin/gen-kubeconfig
+WORKDIR /kube
+ENTRYPOINT ["/usr/local/bin/gen-kubeconfig"]

kubeconfig/gen-kubeconfig.sh

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+#!/bin/sh
+set -e
+
+TOKEN=$(cat /var/run/secrets/kubernetes.io/serviceaccount/token)
+CA=/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
+NS=$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace)
+APISERVER="https://${KUBERNETES_SERVICE_HOST}:${KUBERNETES_SERVICE_PORT}"
+
+cat <<EOF > /kube/config
+apiVersion: v1
+kind: Config
+clusters:
+- cluster:
+    certificate-authority: ${CA}
+    server: ${APISERVER}
+  name: in-cluster
+contexts:
+- context:
+    cluster: in-cluster
+    namespace: ${NS}
+    user: sa
+  name: in-cluster
+current-context: in-cluster
+users:
+- name: sa
+  user:
+    token: ${TOKEN}
+EOF
+
+echo "✅ kubeconfig written to /kube/config"