WIP: [Swift+Wasm] initial support for compiling Swift to WebAssembly

.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: [swiftwasm, kateinoigakukun, MaxDesiatov] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/pull.yml

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+version: "1"
+rules:
+  - base: swiftwasm
+    upstream: main
+    mergeMethod: merge
+  - base: main
+    upstream: apple:main
+    mergeMethod: hardreset
+
+  - base: release/5.3
+    upstream: apple:release/5.3
+    mergeMethod: hardreset
+  - base: swiftwasm-release/5.3
+    upstream: release/5.3
+    mergeMethod: merge
+
+  - base: release/5.4
+    upstream: apple:release/5.4
+    mergeMethod: hardreset
+  - base: swiftwasm-release/5.4
+    upstream: release/5.4
+    mergeMethod: merge
+
+  - base: release/5.5
+    upstream: apple:release/5.5
+    mergeMethod: hardreset
+  - base: swiftwasm-release/5.5
+    upstream: release/5.5
+    mergeMethod: merge
+
+  - base: release/5.6
+    upstream: apple:release/5.6
+    mergeMethod: hardreset
+  - base: swiftwasm-release/5.6
+    upstream: release/5.6
+    mergeMethod: merge
+
+  - base: release/5.7
+    upstream: apple:release/5.7
+    mergeMethod: hardreset
+  - base: swiftwasm-release/5.7
+    upstream: release/5.7
+    mergeMethod: merge
+
+  - base: release/5.8
+    upstream: apple:release/5.8
+    mergeMethod: hardreset
+  - base: swiftwasm-release/5.8
+    upstream: release/5.8
+    mergeMethod: merge
+
+label: ":arrow_heading_down: Upstream Tracking"

.github/scripts/build-matrix.rb

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+require "json"
+require "optparse"
+
+BASE_MATRIX_ENTRIES = [
+  {
+    "build_os": "ubuntu-18.04",
+    "agent_query": "ubuntu-20.04",
+    "target": "ubuntu18.04_x86_64",
+    "container": "ghcr.io/swiftwasm/swift-ci:main-ubuntu-18.04",
+    "run_stdlib_test": true,
+    "run_full_test": false,
+    "run_e2e_test": true,
+    "build_hello_wasm": true,
+    "clean_build_dir": false,
+    "free_disk_space": true
+  },
+  {
+    "build_os": "ubuntu-20.04",
+    "agent_query": "ubuntu-20.04",
+    "target": "ubuntu20.04_x86_64",
+    "container": "ghcr.io/swiftwasm/swift-ci:main-ubuntu-20.04",
+    "run_stdlib_test": true,
+    "run_full_test": false,
+    "run_e2e_test": true,
+    "build_hello_wasm": true,
+    "clean_build_dir": false,
+    "free_disk_space": true
+  },
+  {
+    "build_os": "ubuntu-22.04",
+    "agent_query": "ubuntu-22.04",
+    "target": "ubuntu22.04_x86_64",
+    "container": "ghcr.io/swiftwasm/swift-ci:main-ubuntu-22.04",
+    "run_stdlib_test": true,
+    "run_full_test": false,
+    "run_e2e_test": true,
+    "build_hello_wasm": true,
+    "clean_build_dir": false,
+    "free_disk_space": true
+  },
+  {
+    "build_os": "amazon-linux-2",
+    "agent_query": "ubuntu-22.04",
+    "target": "amazonlinux2_x86_64",
+    "container": "ghcr.io/swiftwasm/swift-ci:main-amazon-linux-2",
+    "run_stdlib_test": false,
+    "run_full_test": false,
+    "run_e2e_test": false,
+    "build_hello_wasm": true,
+    "clean_build_dir": false,
+    "free_disk_space": true
+  },
+  {
+    "build_os": "macos-12",
+    "agent_query": "macos-12",
+    "target": "macos_x86_64",
+    "run_stdlib_test": false,
+    "run_full_test": false,
+    "run_e2e_test": false,
+    "build_hello_wasm": false,
+    "clean_build_dir": false
+  },
+  {
+    "build_os": "macos-11",
+    "agent_query": ["self-hosted", "macOS", "ARM64"],
+    "target": "macos_arm64",
+    "run_stdlib_test": false,
+    "run_full_test": false,
+    "run_e2e_test": false,
+    "build_hello_wasm": true,
+    "clean_build_dir": true
+  }
+]
+
+def main
+  options = {}
+  OptionParser.new do |opts|
+    opts.banner = "Usage: build-matrix.rb [options]"
+    opts.on("--runner [JSON FILE]", "Path to runner data file") do |v|
+      options[:runner] = v
+    end
+  end.parse!
+
+  matrix_entries = BASE_MATRIX_ENTRIES.dup
+  if options[:runner]
+    runner = JSON.parse(File.read(options[:runner]))
+    if label = runner["outputs"]["ubuntu20_04_aarch64-label"]
+      matrix_entries << {
+        "build_os": "ubuntu-20.04",
+        "agent_query": label,
+        "target": "ubuntu20.04_aarch64",
+        "container": "ghcr.io/swiftwasm/swift-ci:main-ubuntu-20.04",
+        "run_stdlib_test": false,
+        "run_full_test": false,
+        "run_e2e_test": false,
+        "build_hello_wasm": true,
+        "clean_build_dir": false
+      }
+    end
+  end
+
+  print JSON.generate(matrix_entries)
+end
+
+if $0 == __FILE__
+  main
+end