`-U postgres` might be needed in the PostgreSQL service healthcheck

[bzp99]

Andrés Zapata reported that he needed to make the following change to get the test network running:

diff --git a/test-env/common-services.yml b/test-env/common-services.yml                                                                                  
index 7861819..82224b3 100755                                                                                                                             
--- a/test-env/common-services.yml                                                                                                                        
+++ b/test-env/common-services.yml                                                                                                                        
@@ -22,7 +22,7 @@ services:                                                                                                                               
       POSTGRES_DB: dva                                                                                                                                   
       POSTGRES_PASSWORD: postgres                                                                                                                        
     healthcheck:                                                                                                                                         
-      test: pg_isready                                                                                                                                   
+      test: pg_isready -U postgres                                                                                                                       
       interval: 5s                                                                                                                                       
       timeout: 5s                                                                                                                                        
       retries: 5     

Quoting his email:

In the first modification, the compose was failing to start. It seems that, by default, the version of postgres that docker downloaded in my side was using a different user by default and postgres user had to be specified explicitly.

This seems to be a likely cause.

We should check what version is configured and add the option if really needed (or constrain the version further).