fix: get value from secret

Dockerfile

@@ -23,14 +23,20 @@ ENV EXECUTIONS_DATA_SAVE_ON_SUCCESS=none
 ENV EXECUTIONS_DATA_SAVE_ON_PROGRESS=true
 ENV EXECUTIONS_DATA_SAVE_MANUAL_EXECUTIONS=false
 
+RUN --mount=type=secret,id=SECRET_EXAMPLE,mode=0444,required=true \
+    MY_ENV_VAR=$(cat /run/secrets/SECRET_EXAMPLE) \
+    && export DB_POSTGRESDB_HOST=$DB_POSTGRESDB_HOST \
+    && export DB_POSTGRESDB_PASSWORD=$DB_POSTGRESDB_PASSWORD
+    && export DB_POSTGRESDB_USER=$DB_POSTGRESDB_USER
+
 # Postgres database connection settings
 ENV DB_TYPE=postgresdb
 ENV DB_POSTGRESDB_DATABASE=postgres
-ENV DB_POSTGRESDB_HOST=${POSTGRES_HOST}
+ENV DB_POSTGRESDB_HOST=$POSTGRES_HOST
 ENV DB_POSTGRESDB_PORT=5432
-ENV DB_POSTGRESDB_USER=${POSTGRES_USER}
+ENV DB_POSTGRESDB_USER=$POSTGRES_USER
 ENV DB_POSTGRESDB_SCHEMA=public
-ENV DB_POSTGRESDB_PASSWORD=${POSTGRES_PASSWORD}
+ENV DB_POSTGRESDB_PASSWORD=$POSTGRES_PASSWORD
 
 
 # Expose the smtp port for n8n