Let's just run PowerShell

.github/workflows/deploy.yaml

@@ -11,54 +11,38 @@ permissions:
 
 jobs:
   deploy-bicep:
-    runs-on: ubuntu-latest
     name: Deploy Bicep
+    runs-on: ubuntu-latest
+
     steps:
       - uses: actions/checkout@v3
 
-      - uses: azure/login@v1
-        name: Login to Azure
+      - name: Login to Azure
+        uses: azure/login@v1
         with:
           client-id: ${{ secrets.AZURE_CLIENT_ID }}
           tenant-id: ${{ secrets.AZURE_TENANT_ID }}
           subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
           enable-AzPSSession: true
 
-      # Why on earth can't I just deploy the bicep file?
-      - uses: azure/bicep-build-action@v1.0.0
-        name: Bicep Build
-        with:
-          bicepFilePath: infrastructure/Cluster.bicep
-          outputFilePath: infrastructure/Cluster.json
-
-      - id: name
-        shell: pwsh
-        run: '"name=aks-$(Get-Date -f yyyyMMddThhmmss)" >> $Env:GITHUB_OUTPUT'
-
-      - uses: azure/arm-deploy@v1
-        name: deploy
-        timeout-minutes: 240
-        with:
-          template: infrastructure/Cluster.json
-          subscriptionId: ${{ secrets.AZURE_SUBSCRIPTION }}
-          resourceGroupName: ${{ secrets.AZURE_RG }}
-          parameters: adminId=${{ secrets.ADMIN_GROUP_ID }}
-          deploymentName: ${{ steps.name.outputs.name }}
-
-      - id: deploy-flux
-        shell: pwsh
-        run: |
-          #! Get the cluster credentials
-          Get-AzAksCluster -ResourceGroupName $Env:RESOURCE_GROUP |
-              Import-AzAksCredential -Force
-          #! Update the client ID from the deployment output
-          $kustomize = Get-Content "clusters/poschode/flux/kustomization.ps1"
-          $kustomize = $kustomize -replace "azure.workload.identity/client-id: .*$", "azure.workload.identity/client-id: ${{ steps.deploy.outputs.fluxIdClientId }}"
-          # TODO: commit this file to the repo _before_ running flux
-          $kustomize | Set-Content "clusters/poschode/flux/kustomization.ps1"
-          #! Bootstrap Flux
-          ./infrastructure/Install-Flux.ps1
+      - name: Azure Resource Group Deployment
+        uses: azure/powershell@v1
         env:
+          SUBSCRIPTION: ${{ secrets.AZURE_SUBSCRIPTION }}
+          RESOURCEGROUP: ${{ secrets.AZURE_RG }}
+          ADMINS: ${{ secrets.ADMIN_GROUP_ID }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          RESOURCE_GROUP: ${{ secrets.AZURE_RG }}
-
+        with:
+          azPSVersion: "latest"
+          inlineScript: |
+            $Results = New-AzResourceGroupDeployment -Name "aks-$(Get-Date -f yyyyMMddThhmmss)" -ResourceGroupName $Env:RESOURCEGROUP -TemplateFile ./infrastructure/Cluster.bicep -TemplateParameterObject @{ adminId = $Env:ADMINS }
+            $Results | Out-Host
+            #! Get the cluster credentials
+            Get-AzAksCluster -ResourceGroupName $Env:RESOURCEGROUP | Import-AzAksCredential -Force
+            #! Update the client ID from the deployment output
+            $kustomize = Get-Content "./clusters/poshcode/flux-system/kustomization.yaml"
+            $kustomize = $kustomize -replace "azure.workload.identity/client-id: .*$", "azure.workload.identity/client-id: $($Results.Outputs.fluxIdClientId)"
+            # TODO: commit this file to the repo _before_ running flux
+            $kustomize | Set-Content "./clusters/poshcode/flux-system/kustomization.yaml"
+            #! Bootstrap Flux
+            ./Initialize-Flux.ps1

Initialize-AuthApplication.ps1

@@ -0,0 +1,67 @@
+<#
+    .SYNOPSIS
+        Prepares an Azure subscription, resource group, and service account and puts secrets into a GitHub repo.
+    .DESCRIPTION
+        Creates a new Azure AD application and service principal, and grants it access to a resource group.
+        Also creates a new federated identity credential for the service principal, and sets the secrets
+        for the repo workflows.
+#>
+[CmdletBinding()]
+param(
+    # The identifier URIs to use. E.g. "https://auth.poshcode.com"
+    [string[]]$IdentifierUris = "https://auth.poshcode.com",
+
+    # The service name to use. E.g. "poshcode-auth"
+    [string]$DisplayName = "poshcode-auth",
+
+    # The repo to set secrets for. E.g. "PoshCode/cluster"
+    [string]$repo = "PoshCode/cluster",
+
+    # The name of the secret to create. E.g. "azuread"
+    $Name = "azuread",
+
+    # The namespace to create the secret in. E.g. "traefik"
+    $Namespace = "traefik",
+
+    # The path to the secret file to create. E.g. "system/config/secret.yaml"
+    $Path = "system/config/secret.yaml"
+)
+
+Push-Location $PSScriptRoot -StackName Initialize-AuthApplication
+
+filter global:ToBase64 {
+    [Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes($_))
+}
+filter global:FromBase64 {
+    [Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($_))
+}
+
+$global:app  =  (Get-AzADApplication -DisplayName $DisplayName) ??
+                (New-AzADApplication -DisplayName $DisplayName -IdentifierUris $IdentifierUris -ReplyUrls "$IdentifierUris/_oauth")
+
+$Secret = New-AzADAppCredential -ObjectId $App.Id -PasswordCredentials @{}
+
+$Secret = @"
+apiVersion: v1
+kind: Secret
+metadata:
+  name: $Name
+  namespace: $Namespace
+type: Opaque
+data:
+  client_id: $($app.AppId|ToBase64)
+  client_secret: $($secret.SecretText|ToBase64)
+  endpoint: $("https://login.microsoftonline.com/$((Get-AzContext).Tenant.Id)/v2.0"|ToBase64)
+  random_secret: $([guid]::NewGuid().Guid|ToBase64)
+"@
+
+Write-Verbose "$Path`n$Secret"
+
+Set-Content $Path $Secret -Encoding ascii
+
+sops -e -i $Path
+
+Pop-Location -StackName Initialize-AuthApplication
+
+# https://login.microsoftonline.com/$tenant/v2.0/.well-known/openid-configuration
+# https://login.microsoftonline.com/$tenant/oauth2/v2.0/authorize

infrastructure/Install-Flux.ps1 → Initialize-Flux.ps1

@@ -1,6 +1,6 @@
 <#
     .SYNOPSIS
-        Installs Flux v2 and bootstraps it to/from a git repository
+        Bootstraps Flux v2 to/from a git repository
     .DESCRIPTION
         The `flux bootstrap` command is idempotent, and besides installing (or upgrading) the controllers on the cluster,
         pushes the Flux manifests to the git repository, and configures Flux to update itself from Git.
@@ -59,10 +59,10 @@ param(
     # The passphrase for the SSH key file
     [SecureString]$KeyPassphrase = $global:KeyPassphrase
 )
-Push-Location $PSScriptRoot/.. -StackName InstallFlux
+Push-Location $PSScriptRoot -StackName InstallFlux
 
 # it's literally just a single file binary, but it comes in a zip/tar.gz so we'll just use the install script
-$version = if (Get-Command flux) {
+$version = if (Get-Command flux -ErrorAction Ignore) {
     (flux --version) -replace "flux version\s+"
 }