feat: shared PVC for Terraform storage across applications-rp and dyn…

[vishwahiremat]

Description

This PR changes Terraform storage from pod-local emptyDir volumes to a shared PersistentVolumeClaim with ReadWriteMany access mode. This enables applications-rp and dynamic-rp to share the same Terraform binaries installed via rad terraform install.

Changes:

• New terraform-pvc.yaml template creating a shared PVC (terraform-storage)
• Updated both RP deployments to mount the shared PVC instead of emptyDir
• Added NFS provisioner to Kind cluster setup for RWX support in CI
• Updated Helm tests to validate PVC configuration

Why:
Previously, each RP had its own emptyDir volume, so rad terraform install only affected applications-rp. With a shared PVC, both RPs can access the same installed Terraform binary.

Type of change

• This pull request adds or changes features of Radius and has an approved issue (issue link required).

Fixes: #issue_number

Contributor checklist

Please verify that the PR meets the following requirements, where applicable:

• An overview of proposed schema changes is included in a linked GitHub issue.
  • Yes
  • Not applicable
• A design document PR is created in the design-notes repository, if new APIs are being introduced.
  • Yes
  • Not applicable
• The design document has been reviewed and approved by Radius maintainers/approvers.
  • Yes
  • Not applicable
• A PR for the samples repository is created, if existing samples are affected by the changes in this PR.
  • Yes
  • Not applicable
• A PR for the documentation repository is created, if the changes in this PR affect the documentation or any user facing updates are made.
  • Yes
  • Not applicable
• A PR for the recipes repository is created, if existing recipes are affected by the changes in this PR.
  • Yes
  • Not applicable

[radius-functional-tests]

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Name	Value
Repository	radius-project/radius
Commit ref	31bf832
Unique ID	func6fc3ad20cb
Image tag	pr-func6fc3ad20cb

• gotestsum 1.13.0
• KinD: v0.29.0
• Dapr: 1.14.4
• Azure KeyVault CSI driver: 1.4.2
• Azure Workload identity webhook: 1.3.0
• Bicep recipe location ghcr.io/radius-project/dev/test/testrecipes/test-bicep-recipes/<name>:pr-func6fc3ad20cb
• Terraform recipe location http://tf-module-server.radius-test-tf-module-server.svc.cluster.local/<name>.zip (in cluster)
• applications-rp test image location: ghcr.io/radius-project/dev/applications-rp:pr-func6fc3ad20cb
• dynamic-rp test image location: ghcr.io/radius-project/dev/dynamic-rp:pr-func6fc3ad20cb
• controller test image location: ghcr.io/radius-project/dev/controller:pr-func6fc3ad20cb
• ucp test image location: ghcr.io/radius-project/dev/ucpd:pr-func6fc3ad20cb
• deployment-engine test image location: ghcr.io/radius-project/deployment-engine:latest

Test Status

⌛ Building Radius and pushing container images for functional tests...
✅ Container images build succeeded
⌛ Publishing Bicep Recipes for functional tests...
✅ Recipe publishing succeeded
⌛ Starting corerp-cloud functional tests...
⌛ Starting ucp-cloud functional tests...
❌ Failed to install Radius for corerp-cloud functional test. Please check the logs for more details
❌ corerp-cloud functional test failed. Please check the logs for more details
❌ Failed to install Radius for ucp-cloud functional test. Please check the logs for more details
❌ ucp-cloud functional test cancelled. Please check the logs for more details
⌛ Starting corerp-cloud functional tests...
❌ Failed to install Radius for corerp-cloud functional test. Please check the logs for more details
❌ corerp-cloud functional test failed. Please check the logs for more details