feat(applications): add scalers for cpu and memory (#1295)

<!--- Provide a general summary of your changes in the Title above -->

## Description

- Enable automatic scaling based on CPU and memory for graphql and
web-api (enduser only)
- Setting 70 as the limit, this can be tweaked as we see how the
services behave under load
- Set a max number of 10 revisions for now. We might need to increase
this in yt01

<!--- Describe your changes in detail -->

## Related Issue(s)

- #1293

## Verification

- [ ] **Your** code builds clean without any errors or warnings
- [ ] Manual testing done (required)
- [ ] Relevant automated test added (if you find this hard, leave it and
we'll help out)

## Documentation

- [ ] Documentation is updated (either in `docs`-directory, Altinnpedia
or a separate linked PR in
[altinn-studio-docs.](https://github.com/Altinn/altinn-studio-docs), if
applicable)


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Introduced dynamic scaling configuration for container apps, allowing
for minimum and maximum replicas and custom scaling based on CPU and
memory utilization.
- **Enhancements**
- Improved deployment flexibility with a centralized scaling parameter
for container apps.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.azure/applications/graphql/main.bicep

@@ -106,6 +106,31 @@ var probes = [
   }
 ]
 
+var scale = {
+  minReplicas: 2
+  maxReplicas: 10
+  rules: [
+    {
+      custom: {
+        type: 'cpu'
+        metricType: 'Utilization'
+        metadata: {
+          value: '70'
+        }
+      }
+    }
+    {
+      custom: {
+        type: 'memory'
+        metricType: 'Utilization'
+        metadata: {
+          value: '70'
+        }
+      }
+    }
+  ]
+}
+
 resource environmentKeyVaultResource 'Microsoft.KeyVault/vaults@2023-07-01' existing = {
   name: environmentKeyVaultName
 }
@@ -126,6 +151,7 @@ module containerApp '../../modules/containerApp/main.bicep' = {
     revisionSuffix: revisionSuffix
     probes: probes
     port: port
+    scale: scale
   }
 }
 

.azure/applications/web-api-eu/main.bicep

@@ -77,6 +77,30 @@ var containerAppEnvVars = [
   }
 ]
 
+var scale = {
+  minReplicas: 2
+  maxReplicas: 10
+  rules: [
+    {
+      custom: {
+        type: 'cpu'
+        metricType: 'Utilization'
+        metadata: {
+          value: '70'
+        }
+      }
+    }
+    {
+      custom: {
+        type: 'memory'
+        metricType: 'Utilization'
+        metadata: {
+          value: '70'
+        }
+      }
+    }
+  ]
+}
 resource environmentKeyVaultResource 'Microsoft.KeyVault/vaults@2023-07-01' existing = {
   name: environmentKeyVaultName
 }
@@ -128,6 +152,7 @@ module containerApp '../../modules/containerApp/main.bicep' = {
     resources: resources
     probes: probes
     revisionSuffix: revisionSuffix
+    scale: scale
   }
 }
 

.azure/modules/containerApp/main.bicep

@@ -31,6 +31,12 @@ param revisionSuffix string
 @description('The probes for the container app')
 param probes array = []
 
+@description('The scaling configuration for the container app')
+param scale object = {
+  minReplicas: 1
+  maxReplicas: 1 // temp disable scaling by default for outbox scheduling
+}
+
 // TODO: Refactor to make userAssignedIdentityId a required parameter once all container apps use user-assigned identities
 @description('The ID of the user-assigned managed identity (optional)')
 param userAssignedIdentityId string = ''
@@ -74,10 +80,7 @@ resource containerApp 'Microsoft.App/containerApps@2024-03-01' = {
     environmentId: containerAppEnvId
     template: {
       revisionSuffix: cleanedRevisionSuffix
-      scale: {
-        minReplicas: 1
-        maxReplicas: 1 // temp disable scaling for outbox scheduling
-      }
+      scale: scale
       containers: [
         {
           name: name