ci: prevent supabase test collisions

.gitlab-ci.yml

@@ -36,19 +36,22 @@ test_unit:
 test_db:
   needs: [deps, check_types, check_style]
   dependencies: [deps]
-  script: <<-SUPABASE_DB_SCRIPT
-    npx supabase db diff -f dummy_migration
-    git add -N supabase/migrations
+  before_script:
+    - mkdir ${CI_COMMIT_SHA}
+    - cp -r ./* ${CI_COMMIT_SHA}/
+  script:
+    - cd ${CI_COMMIT_SHA}
+    - npx supabase db diff -f dummy_migration
+    - git add -N supabase/migrations
+    - >
       if ! git diff --exit-code --quiet supabase/migrations; then
         echo "Supabase migrations and schema are not in sync. See diff below:"
         git diff supabase/migrations
         exit 1
       fi
-
-    npx supabase db start
-    npx supabase db reset
-    npx supabase db lint
-    SUPABASE_DB_SCRIPT
+    - npx supabase db start
+    - npx supabase db reset
+    - npx supabase db lint
   after_script:
     - npx supabase stop