feature: add push triggers to cd pipelines (#11)

<!-- Thank you for submitting a Pull Request. Please fill out the
template below.-->
## Overview/Summary

The PR adds back in push triggers for the CD pipelines and ensures they
don't run during the bootstrapping phase.

## This PR fixes/adds/changes/removes

N/A

### Breaking Changes

N/A

## Testing Evidence

Tested on both environments

## As part of this Pull Request I have

- [x] Checked for duplicate [Pull
Requests](https://github.com/Azure/alz-terraform-accelerator/pulls)
- [x] Associated it with relevant
[issues](https://github.com/Azure/alz-terraform-accelerator/issues), for
tracking and closure.
- [x] Ensured my code/branch is up-to-date with the latest changes in
the `main`
[branch](https://github.com/Azure/alz-terraform-accelerator/tree/main)
- [x] Performed testing and provided evidence.
- [x] Updated relevant and associated documentation.

bootstrap/modules/github/repository.tf

@@ -32,6 +32,7 @@ resource "github_repository_file" "alz" {
   content             = each.value.content
   commit_author       = "Azure Landing Zone"
   commit_email        = "[email protected]"
+  commit_message      = "Add ${each.key} [skip ci]"
   overwrite_on_create = true
 }
 

templates/.ci_cd/.azuredevops/cd.yaml

@@ -1,6 +1,8 @@
 ---
 trigger:
-  - none
+  branches:
+    include:
+      - main
 
 parameters:
   - name: terraform_action
@@ -46,13 +48,13 @@ stages:
                   env:
                     ARM_USE_AZUREAD: true
                 - task: TerraformTaskV4@4
-                  displayName: Terraform Plan for $${{ parameters.terraform_action }}
+                  displayName: Terraform Plan for $${{ coalesce(parameters.terraform_action, 'Apply') }}
                   inputs:
                     provider: 'azurerm'
                     command: 'plan'
-                    $${{ if eq(parameters.terraform_action, 'apply') }}:
+                    $${{ if eq(coalesce(parameters.terraform_action, 'apply'), 'apply') }}:
                       commandOptions: '-out=tfplan -input=false'
-                    $${{ if eq(parameters.terraform_action, 'destroy') }}:
+                    $${{ if eq(coalesce(parameters.terraform_action, 'apply'), 'destroy') }}:
                       commandOptions: "-out=tfplan -input=false -destroy"
                     environmentServiceNameAzureRM: '${service_connection_name}'
                   env:
@@ -115,7 +117,7 @@ stages:
                   env:
                     ARM_USE_AZUREAD: true
                 - task: TerraformTaskV4@4
-                  displayName: Terraform $${{ parameters.terraform_action }}
+                  displayName: Terraform $${{ coalesce(parameters.terraform_action, 'Apply') }}
                   inputs:
                     provider: 'azurerm'
                     command: 'apply'

templates/.ci_cd/.github/workflows/cd.yaml

@@ -1,6 +1,9 @@
 ---
 name: Azure Landing Zone Continuous Delivery
 on:
+  push:
+    branches:
+      - main
   workflow_dispatch:
     inputs:
       terraform_action:
@@ -44,7 +47,7 @@ jobs:
           -backend-config="container_name=$${{vars.BACKEND_AZURE_STORAGE_ACCOUNT_CONTAINER_NAME}}" \
           -backend-config="key=terraform.tfstate"
 
-      - name: Terraform Plan for $${{ github.event.inputs.terraform_action }}
+      - name: Terraform Plan for $${{ github.event.inputs.terraform_action == 'destroy' && 'Destroy' || 'Apply' }}
         run: |
           # shellcheck disable=SC2086
           terraform plan -out=tfplan -input=false $${{ github.event.inputs.terraform_action == 'destroy' && '-destroy' || '' }}
@@ -96,5 +99,5 @@ jobs:
           -backend-config="container_name=$${{vars.BACKEND_AZURE_STORAGE_ACCOUNT_CONTAINER_NAME}}" \
           -backend-config="key=terraform.tfstate"
 
-      - name: Terraform $${{ github.event.inputs.terraform_action }}
+      - name: Terraform $${{ github.event.inputs.terraform_action == 'destroy' && 'Destroy' || 'Apply' }}
         run: terraform apply -input=false -auto-approve tfplan