Enhance backend testing in Jenkinsfile by adding Docker container setup for PostgreSQL, improving error handling, and updating environment variable management.

Jenkinsfile

@@ -32,13 +32,42 @@ pipeline {
     }
 
     stage('Test backend') {
-      environment {
-        TEST_DATABASE_URL = credentials('test-database-url')
-      }
       steps {
         sh '''
-          set -euo pipefail
+          set -euxo pipefail
+          echo "== Test backend stage started =="
+          echo "Workspace: $WORKSPACE"
           python3 --version
+          docker --version
+
+          DB_CONTAINER="anexo76-test-db-${BUILD_NUMBER}"
+          DB_NAME="anexo76_test"
+          DB_USER="anexo76"
+          DB_PASS="anexo76"
+          DB_PORT="55432"
+          export TEST_DATABASE_URL="postgresql://${DB_USER}:${DB_PASS}@127.0.0.1:${DB_PORT}/${DB_NAME}"
+
+          cleanup() {
+            docker rm -f "$DB_CONTAINER" >/dev/null 2>&1 || true
+          }
+          trap cleanup EXIT
+
+          docker rm -f "$DB_CONTAINER" >/dev/null 2>&1 || true
+          docker run -d --name "$DB_CONTAINER" \
+            -e POSTGRES_DB="$DB_NAME" \
+            -e POSTGRES_USER="$DB_USER" \
+            -e POSTGRES_PASSWORD="$DB_PASS" \
+            -p "${DB_PORT}:5432" \
+            postgres:16-alpine
+
+          # Espera a que Postgres acepte conexiones
+          for i in $(seq 1 30); do
+            if docker exec "$DB_CONTAINER" pg_isready -U "$DB_USER" -d "$DB_NAME" >/dev/null 2>&1; then
+              break
+            fi
+            sleep 2
+          done
+          docker exec "$DB_CONTAINER" pg_isready -U "$DB_USER" -d "$DB_NAME"
 
           VENV="$WORKSPACE/.pytest-venv"
           python3 -m venv "$VENV"
@@ -48,7 +77,6 @@ pipeline {
           pip install -r "$WORKSPACE/backend/requirements.txt"
 
           cd "$WORKSPACE/backend"
-          export TEST_DATABASE_URL
           alembic upgrade head
           pytest -q tests -v -ra -s
         '''