feat(config): make home directory mount point configurable

Adds HomeDirMountBase to BaseConfig, allowing the host path prefix for per-developer home and linuxbrew volumes to be configured rather than being hardcoded to /mnt/devenv in the StatefulSet template.

Defaults to /mnt/devenv to preserve existing behavior. Also removes stray trailing whitespace from the StatefulSet golden file.

Author: spapa013

internal/config/types.go

@@ -22,6 +22,9 @@ type BaseConfig struct {
 
 	// Storage configuration
 	Volumes []VolumeMount `yaml:"volumes,omitempty" validate:"dive"`
+	// HomeDirMountBase is the host path prefix under which per-developer home
+	// and linuxbrew volumes are created (e.g. /mnt/devenv → /mnt/devenv/<name>/homedir).
+	HomeDirMountBase string `yaml:"homeDirMountBase,omitempty" validate:"omitempty,mount_path"`
 
 	// Access configuration
 	SSHPublicKey any `yaml:"sshPublicKey,omitempty" validate:"omitempty,ssh_keys"` // Can be string or []string
@@ -128,6 +131,7 @@ func NewBaseConfigWithDefaults() BaseConfig {
 		},
 		GitRepos:        []GitRepo{},     // Empty slice - no default git repositories
 		Volumes:         []VolumeMount{}, // Empty slice - no default volumes
+		HomeDirMountBase: "/mnt/devenv", // Default host path prefix for home/linuxbrew volumes
 		Namespace:       "devenv",        // Default namespace
 		EnvironmentName: "development",   // Default environment name
 	}

internal/templates/renderer_test.go

@@ -28,6 +28,7 @@ func TestRenderTemplate(t *testing.T) {
 			Image:     "ubuntu:22.04",
 			Namespace: "devenv-test",
 			HostName:  "devenv.example.com",
+			HomeDirMountBase: "/mnt/devenv",
 			Packages: config.PackageConfig{
 				Python: []string{"numpy", "pandas"},
 				APT:    []string{"vim", "curl"},

internal/templates/template_files/dev/manifests/statefulset.tmpl

@@ -113,11 +113,11 @@ spec:
       volumes:
       - name: dev-storage
         hostPath:
-          path: /mnt/devenv/{{.Name}}/homedir
+          path: {{.HomeDirMountBase}}/{{.Name}}/homedir
           type: DirectoryOrCreate
       - name: dev-linuxbrew
         hostPath:
-          path: /mnt/devenv/{{.Name}}/linuxbrew  
+          path: {{.HomeDirMountBase}}/{{.Name}}/linuxbrew
           type: DirectoryOrCreate
       - name: startup-scripts
         configMap:

internal/templates/testdata/golden/statefulset.yaml

@@ -94,7 +94,7 @@ spec:
           type: DirectoryOrCreate
       - name: dev-linuxbrew
         hostPath:
-          path: /mnt/devenv/testuser/linuxbrew  
+          path: /mnt/devenv/testuser/linuxbrew
           type: DirectoryOrCreate
       - name: startup-scripts
         configMap: