Commits on May 15, 2024

1. Add environment variables for client OS/arch and client user UID/GID …

   When using Docker Compose for development setup, you often need to tweak the configuration to vary on Linux, macOS, and Windows. And some services you would like to run with the same UID/GID as your current client user.
   
   To help with that, we introduce four new environment variables while parsing the configuration files:
   
   - `COMPOSE_CLIENT_OS`: set to Go's `runtime.GOOS`
   - `COMPOSE_CLIENT_ARCH`: set to Go's `runtime.GOARCH`
   - `COMPOSE_CLIENT_UID`: set to the current users UID
   - `COMPOSE_CLIENT_GUID`: set to the current users GID
   
   This way, we can now have a Docker Compose setup like this:
   
   compose.yaml:
   ```yaml
   services:
     php:
       image: php
       volumes:
         - .:/code
       user: ${COMPOSE_CLIENT_UID}:${COMPOSE_CLIENT_GID}
     web:
       image: apache
       extends:
         file: compose.${COMPOSE_CLIENT_OS}.yaml
         service: web
   ```
   
   compose.linux.yaml:
   ```yaml
   services:
     web:
       environment:
         VIRTUAL_HOST: mysite.local
   ```
   
   compose.darwin.yaml:
   ```yaml
   services:
     web:
       environment:
         VIRTUAL_HOST: mysite.docker
   ```
   
   Closes docker#11820.
   
   Signed-off-by: Arne Jørgensen <arne@arnested.dk>

   

   arnested committed May 15, 2024
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