PG::ConnectionBad on Github Actions for Rails - ruby-on-rails

Question

I'm in a problem right now and don't know how to solve this in Github Actions context.
Side context: I'm following a tutorial on setting up Rails-Postgres with GH actions for CI.
Normally when I run into this problem in dev environment, I'd delete a postmaster.pid file. But here, because I'm in a test environment in GH actions, I'm not sure how to solve it. I tried already doing how I would do it in dev env, it unfortunately did not work.
The solutions I've tried:
rm /usr/local/var/postgres/postmaster.pid
Changing the ports within postgres entry in the workflow
My GH Actions Workflow:
name: Test
on: [pull_request]
jobs:
build:
runs-on: ubuntu-latest
services:
postgres:
image: postgres:12.1
ports:
- 6543:6543
options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
steps:
- name: Checkout repository
uses: actions/checkout#v2
- name: Install Ruby version specified in `.ruby-version`
uses: eregon/use-ruby-action#master
- name: Install required apt packages
run: |
sudo apt-get -y install libpq-dev
- name: Setup cache key and directory for gems cache
uses: actions/cache#v1
with:
path: vendor/bundle
key: ${{ runner.os }}-gem-use-ruby-${{ hashFiles('**/Gemfile.lock') }}
- name: Read Node.js version to install from `.nvmrc`
run: echo "##[set-output name=NVMRC;]$(cat .nvmrc)"
id: nvm
- name: Install required Node.js version
uses: actions/setup-node#v1
with:
node-version: "${{ steps.nvm.outputs.NVMRC }}"
- name: Get Yarn cache directory path
id: yarn-cache
run: echo "::set-output name=dir::$(yarn cache dir)"
- name: Setup cache key and directory for node_modules cache
uses: actions/cache#v1
with:
path: ${{ steps.yarn-cache.outputs.dir }}
key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
- name: Bundle install
run: |
gem install bundler -v2.1.4
bundle config path vendor/bundle
bundle install --jobs 4 --retry 3
- name: Yarn install
run: yarn --frozen-lockfile
- name: Run RSpec // ERRORS HERE
run: |
RUBYOPT='-W:no-deprecated -W:no-experimental' bundle exec rails db:prepare
RUBYOPT='-W:no-deprecated -W:no-experimental' bundle exec rspec
It breaks on the Run RSpec task.
Error message:
PG::ConnectionBad: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
Thanks for your help everyone😁

Answer 1

Found a fix!
I needed to add the host, username, and password entry in config/database.yml for the test DB

Answer 2

Because you specified the port for 6543, so PostgreSQL cannot find its default port 5432.
To fix this, specify the port under
services:
postgres:
ports:
- 5432/tcp