Add psr-15 example to examples folder

This example is broken and I don't know why (maybe somebody who knows what they are doing can explain?). But at least now we can _see_ that it is broken, which is better than just silently misleading people...

.github/workflows/continuous_integration.yml

@@ -89,3 +89,33 @@ jobs:
           fail_ci_if_error: false # optional (default = false) - Need CODECOV_TOKEN
         # Do not upload in forks, and only on php8.3, latest deps
         if: ${{ github.repository == 'thecodingmachine/graphqlite' && matrix.php-version == '8.3' && matrix.install-args == '' }}
+
+  examples:
+    name: Check Examples
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        example: ['psr-15']
+      fail-fast: false
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v4"
+      - name: "Install PHP with extensions"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          php-version: "8.2"
+          tools: composer:v2
+      - name: "Install dependencies with composer"
+        working-directory: "examples/${{ matrix.example }}"
+        run: "composer --version && composer install --no-interaction --no-progress --prefer-dist"
+      - name: "Run example ${{ matrix.example }}"
+        working-directory: "examples/${{ matrix.example }}"
+        run: |
+          php -S localhost:8080 &
+          sleep 3
+          curl --silent -X POST -H "Content-Type: application/json" \
+            -d '{"query":"{ hello(name: \"World\") }"}' \
+            http://localhost:8080/graphql -o output.json
+          grep -q '"data":{"hello":"Hello World"}' output.json || \
+            (cat output.json && false)
+          kill %1

examples/psr-15/README.md

@@ -0,0 +1,11 @@
+PSR-15 Integration Example
+==========================
+
+```
+composer install
+php -S 127.0.0.1:8080
+```
+
+```
+curl -X POST -d '{"query":"{ hello(name: \"World\") }"}' -H "Content-Type: application/json" http://localhost:8080/graphql
+```

examples/psr-15/composer.json

@@ -0,0 +1,31 @@
+{
+  "autoload": {
+    "psr-4": {
+      "App\\": "src/"
+    }
+  },
+  "require": {
+    "thecodingmachine/graphqlite": "@dev",
+    "laminas/laminas-diactoros": "^2",
+    "laminas/laminas-stratigility": "^3",
+    "laminas/laminas-httphandlerrunner": "^2",
+    "mouf/picotainer": "^1.1",
+    "symfony/cache": "^4.2"
+  },
+  "repositories": [
+    {
+      "type": "path",
+      "url": "tmp-graphqlite",
+      "options": {
+          "symlink": true
+      }
+    }
+  ],
+  "scripts": {
+    "symlink-package": [
+      "rm -rf tmp-graphqlite && ln -s -f ../../ tmp-graphqlite"
+    ],
+    "pre-install-cmd": "@symlink-package",
+    "pre-update-cmd": "@symlink-package"
+  }
+}