Migrate from Travis CI to GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,46 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "0 3 * * 1" # Every monday at 3 AM
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        crystal: [latest, nightly]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Install Crystal
+        uses: oprypin/install-crystal@v1
+        with:
+          crystal: ${{ matrix.crystal }}
+
+      - name: Download source
+        uses: actions/checkout@v2
+
+      - name: Install dependencies
+        run: shards install
+        env:
+          SHARDS_OPTS: --ignore-crystal-version
+
+      - name: Run specs
+        run: |
+          crystal spec
+          crystal spec --no-debug
+
+      - name: Run specs (release)
+        run: |
+          crystal spec --release
+          crystal spec --release --no-debug
+
+      - name: Check formatting
+        run: crystal tool format --check
+
+      - name: Run ameba linter
+        run: bin/ameba

.travis.yml

@@ -1,20 +0,0 @@
-language: crystal
-
-crystal:
-  - latest
-  - nightly
-
-jobs:
-  allow_failures:
-    - crystal: nightly
-
-install:
-  - shards install
-
-script:
-  - crystal spec
-  - crystal spec --no-debug
-  - crystal spec --release
-  - crystal spec --release --no-debug
-  - crystal tool format --check
-  - bin/ameba

README.md

@@ -1,4 +1,4 @@
-# backtracer.cr [![Build Status](https://travis-ci.com/Sija/backtracer.cr.svg?branch=master)](https://travis-ci.com/Sija/backtracer.cr) [![Releases](https://img.shields.io/github/release/Sija/backtracer.cr.svg)](https://github.com/Sija/backtracer.cr/releases) [![License](https://img.shields.io/github/license/Sija/backtracer.cr.svg)](https://github.com/Sija/backtracer.cr/blob/master/LICENSE)
+# backtracer.cr [![CI](https://github.com/Sija/backtracer.cr/actions/workflows/ci.yml/badge.svg)](https://github.com/Sija/backtracer.cr/actions/workflows/ci.yml) [![Releases](https://img.shields.io/github/release/Sija/backtracer.cr.svg)](https://github.com/Sija/backtracer.cr/releases) [![License](https://img.shields.io/github/license/Sija/backtracer.cr.svg)](https://github.com/Sija/backtracer.cr/blob/master/LICENSE)
 
 Crystal shard aiming to assist with parsing backtraces into a structured form.