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Austen Bruhn
faac75389b
**Add pod-level securityContext support to Coder Helm chart**
Adds `coder.podSecurityContext` field to enable pod-level security
settings, primarily to solve TLS certificate mounting permission issues.
**Problem**: When mounting TLS certificates from Kubernetes secrets, the
Coder process (UID 1000) cannot read the files due to restrictive
permissions.
**Solution**: Setting `podSecurityContext.fsGroup: 1000` ensures
Kubernetes sets group ownership of mounted volumes to GID 1000, allowing
the Coder process to read certificate files.
**Changes**:
- Added `podSecurityContext` field to values.yaml with documentation
- Updated `_coder.yaml` template to include pod-level security context
- Added test case and golden files
- Maintains backward compatibility (opt-in feature)
**Usage**:
```yaml
coder:
podSecurityContext:
fsGroup: 1000 # Enables TLS cert access
```
Fixes #19038