Enable CI for repository (#10)

* Create main.yml for CI

* Code formatting

* Remove composer validation

* Update TruffleHog

* Change PHP support matrix

.github/workflows/main.yml

@@ -0,0 +1,31 @@
+on: ["push", "pull_request"]
+name: Main Workflow
+
+jobs:
+  run:
+    name: Run
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version: [ 7.4, 8.0, 8.1 ]
+
+    steps:
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          tools: composer:v1
+
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: TruffleHog OSS
+        uses: trufflesecurity/trufflehog@main
+        with:
+          path: ./
+          base: ${{ github.event.repository.default_branch }}
+          head: HEAD
+          extra_args: --debug --only-verified