Commits on Aug 31, 2022

1. Fix required env vars ignored except the last one …

   During the variable substitution, if a missing variable was followed
   by an existing one, the empty "outerErr" variable overwrote the previous
   non-empty variable.
   
   Unlike with Docker Compose v1, the first found error did not guarantee
   that an actual error would be thrown.
   
   Example which would have run before the fix even though var1 is not defined:
   
   ```yaml
   services:
     bash:
       image: bash:5.0.18-alpine3.15
       environment:
         var12: "_ ${var1:?Error1} _ ${var2:?Error2} _ "
       command:
         - env
   ```
   
   ```bash
   ```
   
   This change also means that, if multiple variables are missing in one string, the first one will be reported by Docker Compose
   
   Signed-off-by: Ákos Takács <takacs.akos@it-sziget.hu>

   

   rimelek committed Aug 31, 2022
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