feat: support linux aarch64 with ruby 3.1.2

.gitignore

@@ -1,9 +1,11 @@
 /linux/runtime
 /linux/output
+/linux/traveling-ruby-gems*
 /osx/runtime
 /osx/output
 /osx/work
 /windows/cache
 /windows/output
 *.sublime-workspace
 *.tar.gz
+.DS_Store

README.md

@@ -11,7 +11,7 @@ _Note:_ - This is a fork, which currently supports the following platforms and v
 | OSX    | 3.1.2     | x86_64       | ✅         |
 | OSX    | 3.1.2     | aarch64 (arm)| ✅         |
 | Linux  | 3.1.2   | x86_64       | ✅         |
-| Linux  | 3.1.2   | aarch64 (arm)| ❌         |
+| Linux  | 3.1.2   | aarch64 (arm)| ✅         |
 | Windows| 3.1.2 | x86_64       | ❌         |
 | Windows| 3.1.2 | aarch64 (arm)| ❌         |
 

linux/Rakefile

@@ -1,7 +1,7 @@
 IMAGE_VERSION = "1.0"
 VERSION       = File.read("../VERSION.txt").strip
 RUBY_VERSIONS = File.read("../RUBY_VERSIONS.txt").strip.split(/\s+/)
-ARCHITECTURES = ["x86_64"]
+ARCHITECTURES = ["x86_64",'arm64']
 CONCURRENCY   = `./internal/cpucount`.to_i + 1
 
 task :default => :package
@@ -41,7 +41,7 @@ ARCHITECTURES.each do |arch|
 
   desc "Build the #{arch} Docker image"
   task "image:#{arch}" do
-    sh "docker build --pull" \
+    sh "docker build" \
       " -t phusion/traveling-ruby-builder-#{arch}:#{IMAGE_VERSION}" \
       " -f image/Dockerfile-#{arch} image"
   end

linux/image/Dockerfile-arm64

@@ -0,0 +1,3 @@
+FROM --platform=linux/arm64 phusion/holy-build-box:3.0
+ADD . /tr_build
+RUN env ARCHITECTURE=arm64 /tr_build/install.sh

linux/image/Dockerfile-x86_64

@@ -1,3 +1,3 @@
-FROM phusion/holy-build-box-64:3.0
+FROM --platform=linux/amd64 phusion/holy-build-box:3.0
 ADD . /tr_build
 RUN env ARCHITECTURE=x86_64 /tr_build/install.sh