Fix loading env file (#1679)

* fix: update loading 'env_file' of docker_compose

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

* test: add functional tests for loading env_file

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

---------

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

script/test/fixtures/expose/output-k8s.yaml

@@ -6,6 +6,7 @@ metadata:
   labels:
     io.kompose.service: redis
   name: redis
+  namespace: default
 spec:
   ports:
     - name: "6379"
@@ -28,6 +29,7 @@ metadata:
   labels:
     io.kompose.service: web
   name: web
+  namespace: default
 spec:
   ports:
     - name: "5000"
@@ -46,6 +48,7 @@ metadata:
   labels:
     io.kompose.service: redis
   name: redis
+  namespace: default
 spec:
   replicas: 1
   selector:
@@ -81,6 +84,7 @@ metadata:
   labels:
     io.kompose.service: web
   name: web
+  namespace: default
 spec:
   replicas: 1
   selector:
@@ -121,6 +125,7 @@ metadata:
   labels:
     io.kompose.service: web
   name: web
+  namespace: default
 spec:
   ingressClassName: nginx
   rules:

script/test/fixtures/expose/output-os.yaml

@@ -6,6 +6,7 @@ metadata:
   labels:
     io.kompose.service: redis
   name: redis
+  namespace: default
 spec:
   ports:
     - name: "6379"
@@ -28,6 +29,7 @@ metadata:
   labels:
     io.kompose.service: web
   name: web
+  namespace: default
 spec:
   ports:
     - name: "5000"
@@ -46,6 +48,7 @@ metadata:
   labels:
     io.kompose.service: redis
   name: redis
+  namespace: default
 spec:
   replicas: 1
   selector:
@@ -94,6 +97,7 @@ metadata:
   labels:
     io.kompose.service: redis
   name: redis
+  namespace: default
 spec:
   lookupPolicy:
     local: false
@@ -122,6 +126,7 @@ metadata:
   labels:
     io.kompose.service: web
   name: web
+  namespace: default
 spec:
   replicas: 1
   selector:
@@ -171,6 +176,7 @@ metadata:
   labels:
     io.kompose.service: web
   name: web
+  namespace: default
 spec:
   lookupPolicy:
     local: false
@@ -195,6 +201,7 @@ metadata:
   labels:
     io.kompose.service: web
   name: web
+  namespace: default
 spec:
   host: batman.example.com/dev,batwoman.example.com
   port: