Add alpine images

images/alpine/3.10/Dockerfile

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+FROM alpine:3.10

images/alpine/3.8/Dockerfile

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+FROM alpine:3.8
+
+RUN apk update && \
+    apk add --no-cache git \
+        php \
+        wget \
+        curl \
+        php7-mbstring \
+        php7-mcrypt \
+        php7-pdo \
+        php7-xml \
+        php7-json \
+        php7-session \
+        php7-fpm \
+        php7-openssl \
+        php7-phar \
+        php7-zip \
+        php7-dom \
+        php7-xml \
+        php7-xmlwriter \
+        php7-tokenizer \
+        php7-pdo_sqlite
+
+RUN apk add --no-cache --virtual  \
+        build-dependencies \
+        build-base \
+        bash \
+        make \
+        gcc \
+        php7-dev && \
+    cd /opt && \
+    rm -rf cphalcon && \
+    git clone --branch '4.0.x' "git://github.com/phalcon/cphalcon.git" && \
+    cd cphalcon/build && \
+    ./install && \
+
+    cd /opt && \
+    rm -rf php-psr && \
+    git clone https://github.com/jbboehr/php-psr.git && \
+    cd php-psr && \
+    phpize && \
+    ./configure && \
+    make && make install && \
+
+    echo -e "extension=psr.so \nextension=phalcon.so" > /etc/php7/conf.d/00_phalcon.ini && \
+
+    apk del build-dependencies \
+        build-base \
+        make \
+        gcc \
+        php7-dev && \
+    rm -rf /tmp/*
+
+EXPOSE 9000 80 443
+
+CMD php-fpm7 -F -R

images/alpine/3.9/Dockerfile

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+FROM alpine:3.9

images/alpine/edge/Dockerfile

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+FROM alpine:edge
+
+