fix: ensure correct appsettings is used (#1086)

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## Description

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

## Related Issue(s)

- #{issue number}

## 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)

.azure/applications/sync-subject-resource-mappings-job/main.bicep

@@ -52,7 +52,7 @@ var containerAppEnvVars = [
     secretRef: 'dbconnectionstring'
   }
   {
-    name: 'ASPNETCORE_ENVIRONMENT'
+    name: 'DOTNET_ENVIRONMENT'
     value: environment
   }
   {

docker-compose-jobs.yml

@@ -9,7 +9,7 @@ services:
       dockerfile: src/Digdir.Domain.Dialogporten.Janitor/Dockerfile
     environment:
       - Infrastructure:DialogDbConnectionString=${DB_CONNECTION_STRING}
-      - ASPNETCORE_ENVIRONMENT=Development
+      - DOTNET_ENVIRONMENT=Development
     command: [ "sync-subject-resource-mappings" ]
     depends_on:
       dialogporten-postgres: