Twingate / kubernetes-operator / 18790514459

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feat: Add PodDisruptionBudget twingate operator (#820)

## Summary

This PR adds configurable PodDisruptionBudget support to the
twingate-operator Helm chart.

## Changes

- Created new PDB template (`pdb.yaml`) with values-driven configuration
- Added PDB configuration to `values.yaml` (disabled by default for
backward compatibility)
- Supports both `minAvailable` and `maxUnavailable` configurations
- Added comprehensive test suite (`pdb_test.yaml`) with 5 test cases
covering:
  - Disabled PDB behavior
  - minAvailable configuration
  - maxUnavailable configuration
  - Metadata validation
  - Selector labels validation

## Configuration

```yaml
pdb:
  create: false        # Set to true to enable PDB
  minAvailable: 1      # Minimum number of pods that must remain available
  maxUnavailable: ""   # Maximum number/percentage of pods that can be unavailable
```

## Test Plan

- Unit tests added in `pdb_test.yaml`
- Helm chart linting passes
- Template rendering verified

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Eran Kampf <205185+ekampf@users.noreply.github.com>

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