ci: Add PR jobs for code formatting, macOS testing, and linux testing

Author: Garrett Moseke

.github/workflows/pull_request.yml

@@ -0,0 +1,35 @@
+name: Pull Requst
+
+on: [pull_request]
+
+jobs:
+  lint:
+    name: Lint Formatting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Lint Formatting
+        run: swift format lint --recursive --strict .
+
+  test-macos:
+    name: Test macOS using Xcode latest-stable
+    runs-on: macos-latest
+    steps:
+      - uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: latest-stable
+      - uses: actions/checkout@v4
+      - name: Run tests
+        run: swift test -Xswiftc -warnings-as-errors -Xcc -Werror
+
+  test-ubuntu-latest:
+    name: Test Swift ${{ matrix.swift }} Ubuntu Latest
+    strategy:
+      matrix:
+        swift: ["6.0", "6.0.1", "6.0.2"]
+    runs-on: ubuntu-latest
+    container: swift:${{ matrix.swift }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run Tests
+        run: swift test -Xswiftc -warnings-as-errors -Xcc -Werror