Switch to GitHub Actions for CI (#544)

.github/workflows/ci.yaml

@@ -0,0 +1,47 @@
+---
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+      - 'releases/*'
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Build
+    runs-on: macOS-latest
+    strategy:
+      matrix:
+        platform: ['iOS Simulator,name=iPhone 8']
+    steps:
+      - uses: actions/checkout@v1
+      - name: Analyze and Test
+        run: |
+          xcodebuild clean analyze test \
+            -destination "platform=${{ matrix.platform }}" \
+            -sdk "iphonesimulator" \
+            -project PINRemoteImage.xcodeproj \
+            -scheme PINRemoteImageCache \
+            ONLY_ACTIVE_ARCH=NO \
+            CODE_SIGNING_REQUIRED=NO \
+          | xcpretty
+  cocoapods:
+    name: CocoaPods
+    runs-on: macOS-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Lint
+        run: pod lib lint
+  carthage:
+    name: Carthage
+    runs-on: macOS-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Update
+        run: carthage update --no-use-binaries --no-build
+      - name: Build
+        run: carthage build --no-skip-current

README.md

@@ -4,7 +4,7 @@
 
 [![CocoaPods compatible](https://img.shields.io/cocoapods/v/PINRemoteImage.svg?style=flat)](https://cocoapods.org/pods/PINRemoteImage)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
-[![Build status](https://badge.buildkite.com/556f751bb6455e96687a5f8fb05a65f2df9db8b033121b8c3d.svg?branch=master&style=flat)](https://buildkite.com/pinterest/pinremoteimage)
+[![Build status](https://github.com/pinterest/PINRemoteImage/workflows/CI/badge.svg)](https://github.com/pinterest/PINRemoteImage/actions?query=workflow%3ACI+branch%3Amaster)
 
 [PINRemoteImageManager](Source/Classes/PINRemoteImageManager.h) is an image downloading, processing and caching manager. It uses the concept of download and processing tasks to ensure that even if multiple calls to download or process an image are made, it only occurs one time (unless an item is no longer in the cache). PINRemoteImageManager is backed by **GCD** and safe to **access** from **multiple threads** simultaneously. It ensures that images are decoded off the main thread so that animation performance isn't affected. None of its exposed methods allow for synchronous access. However, it is optimized to call completions on the calling thread if an item is in its memory cache.