add postgres and refactor code

deploy/templates/deployment.yaml

@@ -28,7 +28,7 @@ spec:
             - name: PORT
               value: {{ .Values.app.server.port | quote }}
             - name: CONNECTION_STRING
-              value: /app/test.db
+              value: {{ .Values.app.db.connection_string }}
             {{- .Values.envs | toYaml | nindent 12 }}
 
           image: {{ .Values.app.image }}:{{ .Chart.AppVersion }}

deploy/values.template.yaml

@@ -1,6 +1,8 @@
 app:
   fullName: ${CI_PROJECT_TITLE}
   image: docker-registry.dopcore.com/${CI_PROJECT_PATH}
+  db:
+    connection_string: ${CONNECTION_STRING}
   server:
     port: ${SERVICE_PORT}