Add update-initial-pipelines script using buildkit

.envrc.sample

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+export BUILDKITE_TOKEN=changeme

.gitignore

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+.envrc

Gemfile

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+source "https://rubygems.org"
+
+gem "buildkit"

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.8.4)
+      public_suffix (>= 2.0.2, < 6.0)
+    buildkit (1.5.0)
+      sawyer (>= 0.6)
+    faraday (2.7.7)
+      faraday-net_http (>= 2.0, < 3.1)
+      ruby2_keywords (>= 0.0.4)
+    faraday-net_http (3.0.2)
+    public_suffix (5.0.1)
+    ruby2_keywords (0.0.5)
+    sawyer (0.9.2)
+      addressable (>= 2.3.5)
+      faraday (>= 0.17.3, < 3)
+
+PLATFORMS
+  arm64-darwin-23
+
+DEPENDENCIES
+  buildkit
+
+BUNDLED WITH
+   2.4.10

update-initial-pipelines

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+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "buildkit"
+
+def buildkite_token
+  ENV.fetch("BUILDKITE_TOKEN") {
+    raise "BUILDKITE_TOKEN undefined!"
+  }
+end
+
+def update_pipeline(pipeline, configuration)
+  client = Buildkit.new(token: buildkite_token)
+  resp = client.update_pipeline("rails", pipeline, {
+    configuration: configuration
+  })
+  puts resp.steps.to_s
+end
+
+# Update rails/rails
+puts "Updating rails/rails..."
+rails_init = File.read("rails-initial-pipeline.yml")
+update_pipeline("rails", rails_init)
+
+puts "\n" * 2; puts "#####"; puts "\n" * 2
+
+# Update rails/rails-ci
+puts "Updating rails/rails-ci..."
+update_pipeline("rails-ci", rails_init)
+
+puts "\n" * 2; puts "#####"; puts "\n" * 2
+
+# Update rails/buildkite-config
+puts "Updating rails/buildkite-config..."
+buildkite_config_init = File.read("buildkite-config-initial-pipeline.yml")
+update_pipeline("buildkite-config", buildkite_config_init)