Update tests (#74)

* chore: migrate CI from Travis/ORCA to GitHub Actions

Travis CI has been unused for this project for years and the "ORCA CI"
workflow was really just a Travis translation, carrying an obsolete
PHP 7.3/8.0 and Symfony 4.4/5.3 matrix.

Replace both with a single .github/workflows/tests.yml:

- Triggers on push and pull_request.
- Matrix over PHP 7.4 (the composer.json floor), 8.4 (current) and 8.5
  (next, non-blocking via continue-on-error while tooling catches up).
- Validates composer.json, installs dependencies and runs the native
  PHPUnit suite directly rather than going through make/ORCA.
- Coding standards (php-cs-fixer, phpmd) run once in a separate job on
  the current PHP version.

Also swap the Travis badge in README.md for the Actions badge and ignore
the modern .php-cs-fixer.cache filename.

* chore: pin the Tests badge to master and document the experimental PHP slot

The badge now reports the default branch explicitly rather than whichever
branch ran most recently.

The non-blocking PHP 8.5 job is a permanent slot for the next PHP release,
not a temporary hedge, so keep continue-on-error in place and promote the
version through the matrix as releases land.

---------

Co-authored-by: Jakob Perry <japerry@users.noreply.github.com>

Author: japerry

.github/workflows/orca.yml

@@ -0,0 +1,78 @@
+name: Tests
+
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  tests:
+    name: PHP ${{ matrix.php-version }}
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # Earliest supported PHP version (see "php" in composer.json).
+          - php-version: "7.4"
+            experimental: false
+          # Current PHP version.
+          - php-version: "8.4"
+            experimental: false
+          # Next PHP version. This slot is always non-blocking by design: it
+          # gives early warning about the upcoming release without failing the
+          # build over tooling that has not caught up yet. When 8.5 becomes
+          # current, promote it and open a new experimental slot for 8.6.
+          - php-version: "8.5"
+            experimental: true
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          coverage: none
+          tools: composer:v2
+
+      - name: Validate composer.json
+        run: composer validate --strict
+
+      - name: Cache Composer packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/composer/files
+          key: composer-${{ matrix.php-version }}-${{ hashFiles('composer.json') }}
+          restore-keys: composer-${{ matrix.php-version }}-
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: PHPUnit
+        run: vendor/bin/phpunit
+
+  lint:
+    name: Coding standards
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.4"
+          coverage: none
+          tools: composer:v2
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: PHP-CS-Fixer
+        run: vendor/bin/php-cs-fixer fix --dry-run --diff -v
+
+      - name: PHPMD
+        run: vendor/bin/phpmd src/,test/ text ./phpmd.xml

.github/workflows/tests.yml

@@ -18,4 +18,5 @@ composer.lock
 # Ignore PHP-CS-Fixer files
 /.php_cs
 /.php_cs.cache
+/.php-cs-fixer.cache
 /cs_fixer_tmp_*

.gitignore

@@ -1,6 +1,6 @@
 # HTTP HMAC Signer for PHP
 
-[![Build Status](https://travis-ci.org/acquia/http-hmac-php.svg)](https://travis-ci.org/acquia/http-hmac-php)
+[![Tests](https://github.com/acquia/http-hmac-php/actions/workflows/tests.yml/badge.svg?branch=master)](https://github.com/acquia/http-hmac-php/actions/workflows/tests.yml)
 [![Total Downloads](https://poser.pugx.org/acquia/http-hmac-php/downloads)](https://packagist.org/packages/acquia/http-hmac-php)
 [![Latest Stable Version](https://poser.pugx.org/acquia/http-hmac-php/v/stable.svg)](https://packagist.org/packages/acquia/http-hmac-php)
 [![License](https://poser.pugx.org/acquia/http-hmac-php/license.svg)](https://packagist.org/packages/acquia/http-hmac-php)