add tutorial how to use minikube in github actions as a CI step

site/content/en/docs/tutorials/setup_minikube_in_github_actions.md

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+---
+title: "Setup minikube as CI step in github actions"
+linkTitle: "minikube in github actions"
+weight: 1
+date: 2020-06-02
+description: >
+  How to use minikube in github actions for testing your app
+---
+
+To install and start a minikube cluster, add the following step to your [github action workflow](https://help.github.com/en/actions/configuring-and-managing-workflows/configuring-a-workflow).
+
+
+  ```yaml
+      steps:
+      - name: start minikube
+        id: minikube
+        uses: medyagh/setup-minikube@master
+  ```
+
+for more information see github actions marketplace [setup-minikube]( https://github.com/marketplace/actions/setup-minikube).
+
+## Example: build image & deploy to minikube on each PR
+
+Requirements:
+
+- a valid Dockerfile
+- a valid `deployment.yaml` file with `imagePullPolicy: Never` see below for an example
+
+Create workflow:
+
+- copy this yaml to your workflow file for example in `.github/workflows/pr.yml`:
+
+  ```yaml
+  name: CI
+  on:
+    - pull_request
+  jobs:
+    job1:
+      runs-on: ubuntu-latest
+      name: build example and deploy to minikbue
+      steps:
+      - uses: actions/checkout@v2
+      - name: Start minikube
+        uses: medyagh/setup-minikube@master
+      - name: Try the cluster !
+        run: kubectl get pods -A
+      - name: Build image
+        run: |
+          export SHELL=/bin/bash
+          eval $(minikube -p minikube docker-env)
+          docker build -f ./Dockerfile -t local/example .
+          echo -n "verifying images:"
+          docker images
+      - name: Deploy to minikube
+        run:
+          kubectl apply -f deploy-to-minikube.yaml
+      - name: Test service URLs
+        run: |
+          minikube service list
+          minikube service example --url
+          echo "------------------opening the service------------------"
+          curl $(minikube service example --url)
+  ```
+
+The above example workflow yaml, will do the following steps on each coming PR:
+
+1. Checks out the the source code
+2. Installs & starts minikube
+3. Tries out the cluster just by running `kubectl` command
+4. Build the docker image using minikube's docker-env feature
+5. Apply the deployment yaml file minikube
+6. Check the service been created in minikube
+
+### Example minikube deployment yaml with a service
+
+  ```yaml
+  apiVersion: apps/v1
+  kind: Deployment
+  metadata:
+      name: example
+  spec:
+      selector:
+          matchLabels:
+              app: example
+      replicas: 2
+      template:
+          metadata:
+              labels:
+                  app: example
+          spec:
+              containers:
+                  - name: example-api
+                    imagePullPolicy: Never
+                    image: local/example:latest
+                    resources:
+                        limits:
+                            cpu: 50m
+                            memory: 100Mi
+                        requests:
+                            cpu: 25m
+                            memory: 10Mi
+                    ports:
+                        - containerPort: 8080
+  ---
+  apiVersion: v1
+  kind: Service
+  metadata:
+      name: example
+  spec:
+      type: NodePort
+      selector:
+          app: example
+      ports:
+          - port: 8080
+            targetPort: 8080
+  ```