add job to auto-update kubeadm constants for images

.github/workflows/update-kubadm-constants.yml

@@ -0,0 +1,48 @@
+name: "update-kubeadm-constants"
+on:
+  workflow_dispatch:
+  schedule:
+    # every Monday at around midnight pacific/7 am UTC
+    - cron: "0 6 * * 1"
+env:
+  GOPROXY: https://proxy.golang.org
+  GO_VERSION: '1.17.3'
+jobs:
+  bump-k8s-versions:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: ${{env.GO_VERSION}}
+          stable: true
+      - name: Bump Kubeadm Constants for Kubernetes Images
+        id: bumpKubAdmConsts
+        run: |
+          make update-kubeadm-constants
+          c=$(git status --porcelain)
+          c="${c//$'\n'/'%0A'}"
+          c="${c//$'\r'/'%0D'}"
+          echo "::set-output name=changes::$c"
+      - name: Create PR
+        if: ${{ steps.bumpKubAdmConsts.outputs.changes != '' }}
+        uses: peter-evans/create-pull-request@v3
+        with:
+          token: ${{ secrets.MINIKUBE_BOT_PAT }}
+          commit-message: update image constants for kubeadm images
+          committer: minikube-bot <minikube-bot@google.com>
+          author: minikube-bot <minikube-bot@google.com>
+          branch: auto_bump_kubeadm_constants
+          push-to-fork: minikube-bot/minikube
+          base: master
+          delete-branch: true
+          title: 'Bump kubeadm constants for kubernetes images'
+          labels: ok-to-test
+          body: |
+            This PR was auto-generated by `make update-kubeadm-constants` using [update-kubeadm-constants.yml](https://github.com/kubernetes/minikube/tree/master/.github/workflows) CI Workflow. 
+            Please only merge if all the tests pass.
+            
+            ```
+            ${{ steps.bumpKubAdmConsts.outputs.changes }}
+            ```
+

hack/update/golang_version/update_golang_version.go

@@ -85,6 +85,11 @@ var (
 				`GO_VERSION: .*`: `GO_VERSION: '{{.StableVersion}}'`,
 			},
 		},
+		".github/workflows/update-kubadm-constants.yml": {
+			Replace: map[string]string{
+				`GO_VERSION: .*`: `GO_VERSION: '{{.StableVersion}}'`,
+			},
+		},
 		".github/workflows/update-golang-version.yml": {
 			Replace: map[string]string{
 				`GO_VERSION: .*`: `GO_VERSION: '{{.StableVersion}}'`,