Add test files

Start with promtail config file for now.

Based on
https://github.com/cloudfoundry/otel-collector-release

Author: jorbaum

.github/workflows/scripts.yml

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+name: scripts
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+
+jobs:
+  spec-test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: '3.4'
+        bundler-cache: true
+    - run: ./scripts/subtests/spec-test

Gemfile

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+source 'https://rubygems.org'
+
+gem 'rspec'
+gem 'bosh-template'

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    bosh-template (2.4.0)
+      semi_semantic (~> 1.2.0)
+    diff-lcs (1.6.2)
+    rspec (3.13.1)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.4)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.5)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.5)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.4)
+    semi_semantic (1.2.0)
+
+PLATFORMS
+  arm64-darwin-24
+  ruby
+
+DEPENDENCIES
+  bosh-template
+  rspec
+
+BUNDLED WITH
+   2.6.9

scripts/subtests/spec-test

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+#!/bin/bash
+
+set -eux
+set -o pipefail
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+
+set +e
+bundler_executable=$(which bundle)
+set -e
+if [ -z "${bundler_executable}" ] || [ ! -x "${bundler_executable}" ]; then
+  gem install bundler
+fi
+
+pushd "${SCRIPT_DIR}/../.." > /dev/null
+  bundle install
+  bundle exec rspec
+popd > /dev/null

spec/jobs/promtail_spec.rb

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+# frozen_string_literal: true
+
+require 'rspec'
+require 'bosh/template/test'
+
+describe 'promtail config/config.yml.erb' do
+  let(:release_dir) { File.join(File.dirname(__FILE__), '../..') }
+  let(:release) { Bosh::Template::Test::ReleaseDir.new(release_dir) }
+  let(:job) { release.job('promtail') }
+  let(:template) { job.template('config/config.yml') }
+
+  let(:properties) do
+    {
+      'promtail' => {
+        'loki' => {
+          'server' => {
+            'http_listen_address' => 'loki.example.com',
+            'http_listen_port' => 3100
+          },
+          'external_labels' => {}
+        }
+      }
+    }
+  end
+
+  let(:rendered) { YAML.safe_load(template.render(properties)) }
+
+  context 'when promtail.loki.tls is true' do
+    before { properties['promtail']['loki']['tls'] = true }
+
+    it 'uses https in the loki client url' do
+      expect(rendered['clients'][0]['url']).to eq('https://loki.example.com:3100/loki/api/v1/push')
+    end
+  end
+
+  context 'when promtail.loki.tls is false' do
+    before { properties['promtail']['loki']['tls'] = false }
+
+    it 'uses http in the loki client url' do
+      expect(rendered['clients'][0]['url']).to eq('http://loki.example.com:3100/loki/api/v1/push')
+    end
+  end
+end