Fix env file discovery by using project working directory

The SpecProcessor was using the repository base directory instead of
the project-specific working directory for env file discovery. This
caused FindEnvFiles() to look in the wrong location.

Fix: Use project.WorkingDir (set by compose reader) in Process() to
create the converter with the correct directory context. This ensures
.env files are discovered from the compose project directory.

- Moved working directory detection from constructor to Process()
- Maintains testability by using mocked ComposeProcessor
- All tests pass

Amp-Thread-ID: https://ampcode.com/threads/T-b185b0a5-0079-46ce-ae1d-8c3e80bba402
Co-authored-by: Amp <amp@ampcode.com>

Author: trly

cmd/app.go

@@ -143,7 +143,7 @@ func (a *App) IsPlatformAvailable() bool {
 	return a.platformErr == nil
 }
 
-// newComposeProcessor creates a new compose processor with the repository directory.
-func newComposeProcessor(cfg *config.Settings) ComposeProcessorInterface {
-	return compose.NewSpecProcessor(cfg.RepositoryDir)
+// newComposeProcessor creates a new compose processor.
+func newComposeProcessor(_ *config.Settings) ComposeProcessorInterface {
+	return compose.NewSpecProcessor()
 }

internal/compose/processor.go

@@ -10,23 +10,21 @@ import (
 )
 
 // SpecProcessor processes Docker Compose projects into service specs.
-// It wraps Converter to provide the standard Process interface.
-type SpecProcessor struct {
-	converter *Converter
-}
+type SpecProcessor struct{}
 
-// NewSpecProcessor creates a new SpecProcessor with the given working directory.
-func NewSpecProcessor(workingDir string) *SpecProcessor {
-	return &SpecProcessor{
-		converter: NewConverter(workingDir),
-	}
+// NewSpecProcessor creates a new SpecProcessor.
+func NewSpecProcessor() *SpecProcessor {
+	return &SpecProcessor{}
 }
 
 // Process converts a Docker Compose project to service specs.
+// Uses project.WorkingDir for env file discovery.
 func (p *SpecProcessor) Process(_ context.Context, project *types.Project) ([]service.Spec, error) {
 	if project == nil {
 		return nil, fmt.Errorf("project is nil")
 	}
 
-	return p.converter.ConvertProject(project)
+	// Use project's working directory for env file discovery
+	converter := NewConverter(project.WorkingDir)
+	return converter.ConvertProject(project)
 }