Simplify Workload Identity configuration

[IvanJosipovic]

What problem are you facing?

The current Workload Identity configuration requires a few unnecessary configurations.

Specifying the federatedTokenFile value in the azure-workload-identity-creds.yaml is unnecessary as this value can be retrieved using the AZURE_FEDERATED_TOKEN_FILE env var which is automatically injected into Pods when we enable Workload Identity.

Example Pod:

apiVersion: v1
kind: Pod
metadata:
  labels:
    azure.workload.identity/use: "true"
spec:
  containers:
  - env:
    - name: AZURE_FEDERATED_TOKEN_FILE
      value: /var/run/secrets/azure/tokens/azure-identity-token

Specifying the volume details in the DeploymentRuntimeConfig is also unnecessary as this automatically injected into Pods when we enable Workload Identity. The following config should be sufficient.

apiVersion: pkg.crossplane.io/v1beta1
kind: DeploymentRuntimeConfig
metadata:
  name: function-msgraph
spec:
  deploymentTemplate:
    spec:
      replicas: 1
      selector: {}
      template:
        metadata:
          labels:
            azure.workload.identity/use: "true"
        spec:
          serviceAccountName: function-msgraph
          containers:
            - name: package-runtime
  serviceAccountTemplate:
    metadata:
      annotations:
        azure.workload.identity/client-id: "your-client-id"
      name: function-msgraph

How could this Function help solve your problem?

The function should resolve this value from the env var instead of expecting users to provide it.