Update postgres-service.yml

.github/workflows/postgres-service.yml

@@ -50,7 +50,8 @@ jobs:
           POSTGRES_PASSWORD: postgres
           POSTGRES_DB: postgres
         ports:
-        - 5432:5432
+        # will assign a random free host port
+        - 5432/tcp
         # needed because the postgres container does not provide a healthcheck
         options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
 
@@ -64,4 +65,4 @@ jobs:
         # use postgres for the host here because we have specified a contaienr for the job.
         # If we were running the job on the VM this would be localhost
         POSTGRES_HOST: localhost
-        POSTGRES_PORT: ${{ job.services.postgres.ports[5432] }}
+        POSTGRES_PORT: ${{ job.services.postgres.ports[5432] }} # get randomly assigned published port