Add layer for Symfony Runtime (#231)

* Add layer for Symfony Runtime

* Adding fake test

* Added docs

Readme.md

@@ -64,6 +64,7 @@ functions:
 | Redis              | `${bref-extra:redis-php-74}`          |
 | Scrypt             | `${bref-extra:scrypt-php-74}`         |
 | SPX                | `${bref-extra:spx-php-74}`            |
+| Symfony Runtime    | `${bref-extra:symfony-runtime-php-74}`|
 | Microsoft SQLSRV   | `${bref-extra:sqlsrv-php-74}`         |
 | UUID               | `${bref-extra:uuid-php-74}`           |
 | Xdebug             | `${bref-extra:xdebug-php-74}`         |
@@ -106,6 +107,10 @@ There is more information about the driver ini configuration in the [snowflake c
 but the default configuration is enough in most cases.
 The easiest way review those is to download the [`snowflake_odbc` directory](https://sfc-repo.snowflakecomputing.com/odbc/linux/index.html).
 
+### Symfony Runtime
+
+Read [docs at runtime/bref](https://github.com/php-runtime/bref).
+
 ### SQL Server setup
 
 The SQL Server layer includes both the SQLSRV extension and the PDO_SQLSRV extension ([source](https://github.com/microsoft/msphpsql)).

layers/symfony-runtime/Dockerfile

@@ -0,0 +1,4 @@
+# Build the final image with just the files we need
+FROM scratch
+
+COPY bootstrap /opt/bootstrap

layers/symfony-runtime/bootstrap

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# Fail on error
+set -e
+
+LAMBDA_ARGV=(${_HANDLER//:/ })
+
+while true
+do
+    # We redirect stderr to stdout so that everything
+    # written on the output ends up in Cloudwatch automatically
+    /opt/bin/php "${LAMBDA_ARGV[0]}" 2>&1
+done

layers/symfony-runtime/config.json

@@ -0,0 +1,7 @@
+{
+    "php": [
+        "73",
+        "74",
+        "80"
+    ]
+}

layers/symfony-runtime/test.php

@@ -0,0 +1,4 @@
+<?php
+
+// Always pass
+exit(0);