Add support for pgsql (#13)

* Add pgsql layer

* Update README

* Change the order to alphabetical

Author: sabmeua

.travis.yml

@@ -12,6 +12,7 @@ env:
   - LAYER=blackfire PHP="72 73 74"
   - LAYER=gmp PHP="72 73 74"
   - LAYER=memcached PHP="72 73 74"
+  - LAYER=pgsql PHP="72 73 74"
   - LAYER=xdebug PHP="72 73 74"
 
 before_install:

Readme.md

@@ -48,6 +48,7 @@ extension=/opt/bref-extra/amqp.so
 | GMP | `${bref:extra.gmp-php-74}` | `extension=/opt/bref-extra/gmp.so` |
 | Memcache | `${bref:extra.memcached-php-74}` | `extension=/opt/bref-extra/memcache.so` |
 | Memcached | `${bref:extra.memcached-php-74}` | `extension=/opt/bref-extra/memcached.so` |
+| PostgreSQL | `${bref:extra.pgsql-php-74}` | `extension=/opt/bref-extra/pgsql.so` |
 | Xdebug | `${bref:extra.xdebug-php-74}` | `zend_extension=/opt/bref-extra/xdebug.so` |
 
 Note that the "Memcached" layer provides both extension for [Memcache](https://pecl.php.net/package/memcache) and [Memcached](https://pecl.php.net/package/memcached). 

layers/pgsql/Dockerfile

@@ -0,0 +1,15 @@
+ARG PHP_VERSION
+FROM bref/build-php-$PHP_VERSION AS ext
+
+WORKDIR ${PHP_BUILD_DIR}/ext/pgsql
+RUN phpize
+RUN ./configure --with-pgsql=${INSTALL_DIR}
+RUN make -j `nproc` && make install
+
+RUN cp `php-config --extension-dir`/pgsql.so /tmp/pgsql.so
+
+# Build the final image from the lambci image that is close to the production environment
+FROM lambci/lambda:provided
+
+# Copy things we installed to the final image
+COPY --from=ext /tmp/pgsql.so /opt/bref-extra/pgsql.so