ruby-wasm: add pristine ruby.wasm setup with bundler support

based on ruby/ruby.wasm#358

Author: murdho

ruby-wasm/.gitignore

@@ -0,0 +1,3 @@
+*.wasm
+build
+rubies

ruby-wasm/bin/pristine-build

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+#!/usr/bin/env bash
+set -euo pipefail
+
+cd ../pristine
+bundle exec rbwasm build -o ruby.wasm

ruby-wasm/bin/pristine-run

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# Usage:
+#
+#   $ ./pristine-run -e 'puts Time.now'
+#   2024-07-17 16:13:41 +0000
+#
+
+cd ../pristine
+wasmtime run ruby.wasm "$@"

ruby-wasm/pristine/Gemfile

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

ruby-wasm/pristine/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    ruby_wasm (2.6.2-arm64-darwin)
+
+PLATFORMS
+  arm64-darwin
+
+DEPENDENCIES
+  ruby_wasm
+
+BUNDLED WITH
+   2.5.14