debug: CI: use different hostname for postgres container

.woodpecker.yml

@@ -2,7 +2,7 @@ pipeline:
   backend:
     image: rust
     environment:
-      - DATABASE_URL=postgres://postgres:password@database:5432/postgres
+      - DATABASE_URL=postgres://postgres:password@librepages_librepages_postgres_database:5432/postgres
     commands:
       - curl -fsSL https://deb.nodesource.com/setup_16.x | bash - &&\
       - apt update && apt-get -y --no-install-recommends install nodejs
@@ -47,7 +47,7 @@ pipeline:
     secrets: [RELEASE_BOT_GPG_SIGNING_KEY, DUMBSERVE_PASSWORD, GPG_PASSWORD]
 
 services:
-  database:
+  librepages_librepages_postgres_database:
     image: postgres
     environment:
       - POSTGRES_PASSWORD=password