Deploy Infrastructure Using GitHub Actions¶

In the previous section, we demonstrated how Bicep scripts can be used to automate the deployment of infrastructure components. However, creating the container registry and deploying the Bicep scripts using the Azure CLI still required manual effort. For a more efficient and streamlined process, it's preferable to use automation. GitHub Actions is a great solution for automating workflows, and in this section, we'll explain how to create a GitHub Action workflow for deploying the infrastructure components of our application.

The workshop repository contains a GitHub Action workflow file that will be used to deploy the infrastructure components of our application. Follow the steps below to create a GitHub Action workflow to deploy the infrastructure components of our application.

Fork the GitHub repository¶

Start by forking the workshop repository to your GitHub account. Follow the steps below to fork the workshop:

1. Navigate to the workshop repository at Azure/aca-dotnet-workshop
2. Click the Fork button in the top-right corner of the page.
3. Select your GitHub account to fork the repository to.
4. Wait for the repository to be forked.

Configure Repository for OIDC Authentication with Azure AD¶

In order to use the GitHub Actions workflow to deploy the infrastructure components of our application, we need to log in to Azure using the Azure CLI with Azure login action.

The Azure login action supports two different ways of authenticating with Azure:

• Service principal with secrets
• OpenID Connect (OIDC) with a Azure service principal using a Federated Identity Credential

In this workshop, we will use the OIDC authentication method. Assuming you are already logged in using Azure cli locally, follow the steps below to configure the repository for OIDC authentication with Azure AD either using powershell or bash/wsl:

$AZURE_TENANT = az account show -o tsv --query tenantId
$SUBSCRIPTION_ID = az account show -o tsv --query id

$APP_ID = az ad app create --display-name aca-dotnet-workshop-oidc --query appId -otsv

az ad sp create --id $APP_ID --query appId -otsv

$OBJECT_ID = az ad app show --id $APP_ID --query id -otsv

az rest --method POST --uri "https://graph.microsoft.com/beta/applications/$OBJECT_ID/federatedIdentityCredentials" --body '{\"name\":\"aca-dotnet-workshop-federated-identity\",\"issuer\":\"https://token.actions.githubusercontent.com\",\"subject\":\"repo:<Repo owner>/aca-dotnet-workshop:ref:refs/heads/main\",\"description\":\"GitHub\",\"audiences\":[\"api://AzureADTokenExchange\"]}' --headers "Content-Type=application/json"

az role assignment create --assignee $APP_ID --role contributor --scope /subscriptions/$SUBSCRIPTION_ID
az role assignment create --assignee $APP_ID --role 'User Access Administrator' --scope /subscriptions/$SUBSCRIPTION_ID

AZURE_TENANT=$(az account show -o tsv --query tenantId)
SUBSCRIPTION_ID=$(az account show -o tsv --query id)

APP_ID=$(az ad app create --display-name aca-dotnet-workshop-oidc --query appId -otsv)

az ad sp create --id $APP_ID --query appId -otsv

OBJECT_ID=$(az ad app show --id $APP_ID --query id -otsv)

cat <<EOF > body.json
{
    "name": "aca-dotnet-workshop-federated-identity",
    "issuer": "https://token.actions.githubusercontent.com",
    "subject": "repo:<Repo owner>/aca-dotnet-workshop:ref:refs/heads/main",
    "description": "GitHub",
    "audiences": [
        "api://AzureADTokenExchange"
    ]
}
EOF

az rest --method POST --uri "https://graph.microsoft.com/beta/applications/$OBJECT_ID/federatedIdentityCredentials" --body @body.json

az role assignment create --assignee $APP_ID --role contributor --scope /subscriptions/$SUBSCRIPTION_ID
az role assignment create --assignee $APP_ID --role 'User Access Administrator' --scope /subscriptions/$SUBSCRIPTION_ID

Configure GitHub Repository Secrets¶

Configure secrets details in GitHub repo as described here in create GitHub secrets. Use below values mapped to relevant secrets in GitHub.

# AZURE_SUBSCRIPTION_ID
echo $SUBSCRIPTION_ID
# AZURE_TENANT_ID
echo $AZURE_TENANT
# AZURE_CLIENT_ID
echo $APP_ID

Configure GitHub Repository Variables¶

Configure repository variables in GitHub repo as described here in create GitHub variables. Use below values mapped to relevant variables in GitHub.

# LOCATION: Azure region where resources will be deployed
LOCATION=<location. e.g. eastus>

# RESOURCE_GROUP: Name of the resource group which will be created and resources will be deployed
RESOURCE_GROUP=<resource group name>

# (OPTIONAL)CONTAINER_REGISTRY_NAME: Unique name of the container registry which will be created and where images will be imported
CONTAINER_REGISTRY_NAME=<container registry name>

Trigger GitHub Actions Workflow¶

With these steps completed, you are now ready to trigger the GitHub Actions workflow named Build and deploy infrastructure as code to Azure using workflow dispatch to deploy the infrastructure components of the application.