Migrate off Travis CI

.github/workflows/ci.yml

@@ -0,0 +1,55 @@
+name: CI
+
+on: [push]
+
+jobs:
+  old:
+    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: ['ubuntu-28.04']
+        php-versions: ['7.0']
+        phpunit-versions: ['7.5.20']
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, intl, sodium
+          ini-values: post_max_size=256M, max_execution_time=180
+          tools: psalm, phpunit:${{ matrix.phpunit-versions }}
+
+      - name: Install dependencies
+        run: composer self-update --1; composer install
+
+      - name: PHPUnit tests
+        run: vendor/bin/phpunit
+
+  modern:
+    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: ['ubuntu-latest']
+        php-versions: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: mbstring, intl, sodium
+          ini-values: error_reporting=-1, display_errors=On
+          coverage: none
+
+      - name: Install Composer dependencies
+        uses: "ramsey/composer-install@v3"
+
+      - name: PHPUnit tests
+        run: vendor/bin/phpunit

.github/workflows/psalm.yml

@@ -0,0 +1,28 @@
+name: Psalm
+
+on: [push]
+
+jobs:
+  psalm:
+    name: Psalm on PHP ${{ matrix.php-versions }}
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: ['ubuntu-latest']
+        php-versions: ['8.3']
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          tools: psalm:4
+          coverage: none
+
+      - name: Install Composer dependencies
+        uses: "ramsey/composer-install@v3"
+
+      - name: Static Analysis
+        run: psalm

README.md

@@ -1,9 +1,11 @@
 # Blakechain
 
-[![Build Status](https://travis-ci.org/paragonie/blakechain.svg?branch=master)](https://travis-ci.org/paragonie/blakechain)
+[![Build Status](https://github.com/paragonie/blakechain/actions/workflows/ci.yml/badge.svg)](https://github.com/paragonie/blakechain/actions)
+[![Static Analysis](https://github.com/paragonie/blakechain/actions/workflows/psalm.yml/badge.svg)](https://github.com/paragonie/blakechain/actions)
 [![Latest Stable Version](https://poser.pugx.org/paragonie/blakechain/v/stable)](https://packagist.org/packages/paragonie/blakechain)
 [![Latest Unstable Version](https://poser.pugx.org/paragonie/blakechain/v/unstable)](https://packagist.org/packages/paragonie/blakechain)
 [![License](https://poser.pugx.org/paragonie/blakechain/license)](https://packagist.org/packages/paragonie/blakechain)
+[![Downloads](https://img.shields.io/packagist/dt/paragonie/blakechain.svg)](https://packagist.org/packages/paragonie/blakechain)
 
 Blakechain is a simple hash-chain data structure based on the BLAKE2b hash function.