Add workflow for pushes & pull requests

Co-authored-by: Evan Hahn <69474926+EvanHahn-Signal@users.noreply.github.com>

.github/workflows/main.yml

@@ -0,0 +1,20 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  build_and_test:
+    name: Build and Test
+
+    runs-on: macos-latest
+
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v3
+
+      - name: Run pod lib lint
+        run: ./bin/build_and_test.sh

SignalCoreKit/CI.xcconfig

@@ -0,0 +1,6 @@
+//
+//  Copyright (c) 2022 Open Whisper Systems. All rights reserved.
+//
+
+ONLY_ACTIVE_ARCH = YES
+OTHER_SWIFT_FLAGS = $(inherited) -DTESTABLE_BUILD

bin/build_and_test.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+set -e
+set -u
+set -o pipefail
+
+XCODE_XCCONFIG_FILE=SignalCoreKit/CI.xcconfig \
+  pod lib lint --verbose --allow-warnings