feat(env): support env vars for services (both run command and compose)

test/e2e/fixtures/basic-compose.yaml

@@ -1,5 +1,9 @@
 services:
   basic:
+    environment:
+      VAR: "value"
+      BOOL: "true"
+      EMPTY: ""
     image: portainer/pause:3.9
     x-ports:
       - basic.example.com:80/https