keep empty variables in service.environment list

those variables could be used to unset variables in the container

Signed-off-by: Guillaume Lours <[email protected]>

Author: glours

loader/loader_test.go

@@ -597,6 +597,7 @@ services:
 		"GA":  strPtr("2.5"),
 		"BU":  strPtr(""),
 		"MEU": strPtr("Shadoks"),
+		"ZO":  nil,
 	}
 
 	assert.Check(t, is.Equal(2, len(config.Services)))

types/project.go

@@ -639,7 +639,7 @@ func (p *Project) MarshalJSON(options ...func(*marshallOptions)) ([]byte, error)
 func (p Project) WithServicesEnvironmentResolved(discardEnvFiles bool) (*Project, error) {
 	newProject := p.deepCopy()
 	for i, service := range newProject.Services {
-		service.Environment = service.Environment.Resolve(newProject.Environment.Resolve).RemoveEmpty()
+		service.Environment = service.Environment.Resolve(newProject.Environment.Resolve)
 
 		environment := service.Environment.ToMapping()
 		for _, envFile := range service.EnvFiles {