fix postgres password

.gitlab-ci.yml

@@ -2,7 +2,6 @@ variables:
   CI_PROJECT_DIR: "."
   CI_REGISTRY_IMAGE: hub.ducoterra.net/ducoterra/button
   DEPLOY: button
-  POSTGRES_PASSWORD: postgres
 
 stages:
   - build
@@ -22,10 +21,11 @@ build:
 
 test:
   stage: test
+  variables:
+    POSTGRES_PASSWORD: postgres
   only:
     variables:
     - $CI_COMMIT_TAG
-    - POSTGRES_PASSWORD
   services:
   - name: postgres:12
     alias: postgres