Add GHA CI workflow

.github/fixed_podspecs/Dwifft.podspec

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+Pod::Spec.new do |s|
+  s.name = 'Dwifft'
+  s.version = '0.9'
+  s.license = 'MIT'
+  s.summary = 'Swift Diff'
+  s.homepage = 'https://github.com/jflinter/Dwifft'
+  s.social_media_url = 'http://twitter.com/jflinter'
+  s.author = 'Jack Flintermann'
+  s.source = { git: 'https://github.com/jflinter/Dwifft.git', tag: s.version }
+
+  s.swift_version = '5.0'
+
+  s.ios.deployment_target = '12.0'
+  s.tvos.deployment_target = '12.0'
+  s.osx.deployment_target = '10.13'
+
+  s.source_files = 'Dwifft/*.swift'
+
+  s.requires_arc = true
+end

.github/fixed_podspecs/SwiftyJSON.podspec

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+Pod::Spec.new do |s|
+  s.name        = "SwiftyJSON"
+  s.version     = "5.0.1"
+  s.summary     = "SwiftyJSON makes it easy to deal with JSON data in Swift"
+  s.homepage    = "https://github.com/SwiftyJSON/SwiftyJSON"
+  s.license     = { :type => "MIT" }
+  s.authors     = { "lingoer" => "[email protected]", "tangplin" => "[email protected]" }
+
+  s.requires_arc = true
+  s.swift_version = "5.0"
+  s.osx.deployment_target = "10.13"
+  s.ios.deployment_target = "12.0"
+  s.watchos.deployment_target = "4.0"
+  s.tvos.deployment_target = "12.0"
+  s.source   = { :git => "https://github.com/SwiftyJSON/SwiftyJSON.git", :tag => s.version }
+  s.source_files = "Source/SwiftyJSON/*.swift"
+end

.github/workflows/ci.yml

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+name: ci
+on:
+  pull_request:
+
+  workflow_dispatch:
+
+  push:
+    branches:
+      - master
+
+jobs:
+  run_pod_tests:
+    name: Run pod tests
+    runs-on: macos-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+
+      - name: Define validation directory
+        id: define_validation_dir
+        run: echo "path=${{ runner.temp }}/validation_${{ github.run_number }}_${{ github.run_attempt }}" >> $GITHUB_OUTPUT
+
+      - name: Run pod unit tests
+        run: |
+          bundle exec pod lib lint \
+          --allow-warnings \
+          --external-podspecs=".github/fixed_podspecs/**/*.podspec" \
+          --validation-dir="${{ steps.define_validation_dir.outputs.path }}" \
+          --no-clean
+
+      - name: Upload test artifacts
+        if: ${{ failure() }}
+        uses: actions/upload-artifact@v3
+        with:
+          name: test_artifacts
+          path: ${{ steps.define_validation_dir.outputs.path }}