Serverless setting with custom dockerfile

Dockerfile

FROM public.ecr.aws/lambda/ruby:3.2

RUN yum install -y amazon-linux-extras
RUN amazon-linux-extras enable postgresql14
RUN yum group install "Development Tools" -y
RUN yum install -y postgresql postgresql-devel
RUN gem update bundler

CMD "/bin/bash"

Gemfile

# frozen_string_literal: true

source "https://rubygems.org"

git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }

ruby "3.2.2"

gem "activerecord", "~> 7.1"
gem "activerecord-import", "~> 1.5"
gem "pg"

serverless.yml

service: use-docker-file

plugins:
  - serverless-ruby-layer

custom:
  rubyLayer:
    use_docker: true
    docker_file: Dockerfile
    native_libs:
      - /usr/lib64/libpq.so.5
      - /usr/lib64/libldap_r-2.4.so.2
      - /usr/lib64/liblber-2.4.so.2
      - /usr/lib64/libsasl2.so.3
      - /usr/lib64/libssl3.so
      - /usr/lib64/libsmime3.so
      - /usr/lib64/libnss3.so

provider:
  name: aws
  runtime: ruby3.2
  environment:
    LD_PRELOAD: '/opt/lib/libnssutil3.so'

functions:
  hello:
    handler: handler.hello