Add Azure App Service guide

Author: swinton

content/actions/guides/deploying-to-azure-app-service.md

@@ -0,0 +1,101 @@
+---
+title: Deploying to Azure App Service Service
+intro: You can deploy to Azure App Service as part of your continuous deployment (CD) workflows.
+product: '{% data reusables.gated-features.actions %}'
+versions:
+  free-pro-team: '*'
+  enterprise-server: '>=2.22'
+---
+
+{% data reusables.actions.enterprise-beta %}
+{% data reusables.actions.enterprise-github-hosted-runners %}
+
+### Introduction
+[Azure App Service](https://azure.microsoft.com/en-us/services/app-service/) is a Platform-as-a-Service (PaaS) offering from Microsoft, a “fully managed platform for building, deploying and scaling your web apps”. It is a great way to run web apps in several languages including JavaScript, which will be shown here.
+
+This guide assumes you are in the directory of an existing [Node.js](https://nodejs.org/en/) project.
+
+### Prerequisites
+To adopt this workflow, you will first need to complete the following setup steps:
+
+#### Create an App Service plan
+For example, after [authenticating](https://docs.microsoft.com/en-us/cli/azure/authenticate-azure-cli) with `az`, the [Azure CLI](https://docs.microsoft.com/en-us/cli/azure/):
+
+{% raw %}
+```bash{:copy}
+az appservice plan create \
+    --resource-group $AZ_RESOURCE_GROUP \
+    --name $AZ_APP_SERVICE_PLAN \
+    --is-linux
+```
+{% endraw %}
+
+where `$AZ_RESOURCE_GROUP` is a pre-existing Azure Resource Group and `$AZ_APP_SERVICE_PLAN` is a name of your choosing. If you need to set up a new Resource Group, follow [these instructions](https://docs.microsoft.com/en-us/cli/azure/group?view=azure-cli-latest#az_group_create).
+
+#### Create a Web App
+Create an [App Service Web App](https://azure.microsoft.com/en-us/services/app-service/web/) with a [node runtime](https://docs.microsoft.com/en-us/cli/azure/webapp?view=azure-cli-latest#az_webapp_list_runtimes), for example, using the Azure CLI:
+
+{% raw %}
+```bash{:copy}
+az webapp create \
+    --name $AZURE_WEBAPP_NAME \
+    --plan $AZ_APP_SERVICE_PLAN \
+    --resource-group $AZ_RESOURCE_GROUP \
+    --runtime "node|10.14"
+```
+{% endraw %}
+
+where `$AZURE_WEBAPP_NAME` is a webapp name of your choosing.
+
+#### Configure publish profile and store as `AZURE_WEBAPP_PUBLISH_PROFILE` secret
+Next, we will generate Azure deployment credentials via a publish profile using [these instructions](https://docs.microsoft.com/en-us/azure/app-service/deploy-github-actions?tabs=applevel#generate-deployment-credentials), adding them as a [GitHub repository secret](https://docs.github.com/en/free-pro-team@latest/actions/reference/encrypted-secrets) named `AZURE_WEBAPP_PUBLISH_PROFILE`.
+
+### Workflow
+Now that the prerequisite steps are done, consider the following workflow, which will build, test, and deploy the Node.js project to Azure App Service.
+
+{% raw %}
+```bash{:copy}
+on:
+  release:
+    types: [created]
+
+env:
+  AZURE_WEBAPP_NAME: your-app-name    # set this to your application's name
+  AZURE_WEBAPP_PACKAGE_PATH: '.'      # set this to the path to your web app project, defaults to the repository root
+  NODE_VERSION: '10.x'                # set this to the node version to use
+
+jobs:
+  build-and-deploy:
+    name: Build and Deploy
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Use Node.js ${{ env.NODE_VERSION }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ env.NODE_VERSION }}
+
+    - name: npm install, build, and test
+      run: |
+        # Build and test the project, then
+        # deploy to Azure Web App.
+        npm install
+        npm run build --if-present
+        npm run test --if-present
+
+    - name: 'Deploy to Azure WebApp'
+      uses: azure/webapps-deploy@v2
+      with:
+        app-name: ${{ env.AZURE_WEBAPP_NAME }}
+        publish-profile: ${{ secrets.AZURE_WEBAPP_PUBLISH_PROFILE }}
+        package: ${{ env.AZURE_WEBAPP_PACKAGE_PATH }}
+```
+{% endraw %}
+
+### Additional resources
+The following additional resources may also be of use:
+
+1. [Azure App Service starter workflow](https://github.com/actions/starter-workflows/blob/master/ci/azure.yml) for the full starter workflow
+1. [`Azure/webapps-deploy`](https://github.com/Azure/webapps-deploy), the Azure action used
+1. [App Service quickstart -- Node.js](https://docs.microsoft.com/en-us/azure/app-service/quickstart-nodejs) for a quickstart using the [VSCode Azure App Service extension](https://marketplace.visualstudio.com/items?itemName=ms-azuretools.vscode-azureappservice)