fixed php-fpm install phalcon ext bug (#1811)

* add phalcon ext
* fixed phalcon install
* update index.md
* php-worker install phalcon ext

php-worker/Dockerfile

@@ -16,6 +16,7 @@ RUN apk --update add wget \
   libmemcached-dev \
   libmcrypt-dev \
   libxml2-dev \
+  pcre-dev \
   zlib-dev \
   autoconf \
   cyrus-sasl-dev \
@@ -65,6 +66,20 @@ RUN if [ ${INSTALL_ZIP_ARCHIVE} = true ]; then \
 RUN rm /var/cache/apk/* \
     && mkdir -p /var/www
 
+# Install Phalcon ext
+ARG INSTALL_PHALCON=false
+ARG PHALCON_VERSION
+ENV PHALCON_VERSION ${PHALCON_VERSION}
+
+RUN if [ $INSTALL_PHALCON = true ]; then \
+    apk --update add unzip gcc make re2c bash\
+    && curl -L -o /tmp/cphalcon.zip https://github.com/phalcon/cphalcon/archive/v${PHALCON_VERSION}.zip \
+    && unzip -d /tmp/ /tmp/cphalcon.zip \
+    && cd /tmp/cphalcon-${PHALCON_VERSION}/build \
+    && ./install \
+    && rm -rf /tmp/cphalcon* \
+;fi
+
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