Add workflow to check missing and unused deps

.github/workflows/dependency-checks.yml

@@ -0,0 +1,89 @@
+name: "Dependency Checks"
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+env:
+  php_extensions: ""
+  default_php: 8.0
+  composer_install: "composer install --prefer-dist --no-progress --no-interaction"
+
+jobs:
+
+  composer-require-checker:
+    name: "Check for missing dependencies"
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v2
+
+      - name: "Install PHP"
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ env.default_php }}
+          ini-values: memory_limit=-1
+          extensions: ${{ env.php_extensions }}
+
+      - name: "Get Composer cache directory"
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-dir)"
+
+      - name: "Cache dependencies"
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-${{ env.default_php }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: "Install dependencies"
+        run: ${{ env.composer_install }}
+
+      - name: "Set global composer bin-dir"
+        run: composer global config bin-dir /usr/local/bin
+
+      - name: "Install require checker"
+        run: composer global require maglnet/composer-require-checker
+
+      - name: "Check"
+        run: /usr/local/bin/composer-require-checker check
+
+  composer-unused:
+    name: "Check for Unused Dependencies"
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v2
+
+      - name: "Install PHP"
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ env.default_php }}
+          ini-values: memory_limit=-1
+          extensions: ${{ env.php_extensions }}
+
+      - name: "Get Composer cache directory"
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-dir)"
+
+      - name: "Cache dependencies"
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-${{ env.default_php }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: "Install dependencies"
+        run: ${{ env.composer_install }}
+
+      - name: "Set global composer bin-dir"
+        run: composer global config bin-dir /usr/local/bin
+
+      - name: "Install Composer Unused"
+        run: composer global require icanhazstring/composer-unused
+
+      - name: "Check"
+        run: composer unused