Feature: Docker armhf support (#1041)

Docker: add Alpine Linux ARM HF latest and master images

See:
- http://www.armhf.com/
- https://wiki.alpinelinux.org/wiki/Alpine_on_ARM
- https://hub.docker.com/r/lsiobase/alpine.armhf/

docker/alpine/Dockerfile.armhf.latest

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+FROM lsiobase/alpine.armhf:3.6
+MAINTAINER Shaarli Community
+
+RUN apk --update --no-cache add \
+        ca-certificates \
+        curl \
+        nginx \
+        php7 \
+        php7-ctype \
+        php7-curl \
+        php7-fpm \
+        php7-gd \
+        php7-iconv \
+        php7-intl \
+        php7-json \
+        php7-mbstring \
+        php7-openssl \
+        php7-phar \
+        php7-session \
+        php7-xml \
+        php7-zlib \
+        s6
+
+COPY nginx.conf /etc/nginx/nginx.conf
+COPY php-fpm.conf /etc/php7/php-fpm.conf
+COPY services.d /etc/services.d
+
+RUN curl -sS https://getcomposer.org/installer | php7 -- --install-dir=/usr/local/bin --filename=composer \
+    && rm -rf /etc/php7/php-fpm.d/www.conf \
+    && sed -i 's/post_max_size.*/post_max_size = 10M/' /etc/php7/php.ini \
+    && sed -i 's/upload_max_filesize.*/upload_max_filesize = 10M/' /etc/php7/php.ini
+
+
+WORKDIR /var/www
+RUN curl -L https://github.com/shaarli/Shaarli/archive/latest.tar.gz | tar xzf - \
+    && mv Shaarli-latest shaarli \
+    && cd shaarli \
+    && composer --prefer-dist --no-dev install \
+    && rm -rf ~/.composer \
+    && chown -R nginx:nginx .
+
+VOLUME /var/www/shaarli/data
+
+EXPOSE 80
+
+ENTRYPOINT ["/bin/s6-svscan", "/etc/services.d"]
+CMD []

docker/alpine/Dockerfile.armhf.master

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+FROM lsiobase/alpine.armhf:3.6
+MAINTAINER Shaarli Community
+
+RUN apk --update --no-cache add \
+        ca-certificates \
+        curl \
+        nginx \
+        php7 \
+        php7-ctype \
+        php7-curl \
+        php7-fpm \
+        php7-gd \
+        php7-iconv \
+        php7-intl \
+        php7-json \
+        php7-mbstring \
+        php7-openssl \
+        php7-phar \
+        php7-session \
+        php7-xml \
+        php7-zlib \
+        s6
+
+COPY nginx.conf /etc/nginx/nginx.conf
+COPY php-fpm.conf /etc/php7/php-fpm.conf
+COPY services.d /etc/services.d
+
+RUN curl -sS https://getcomposer.org/installer | php7 -- --install-dir=/usr/local/bin --filename=composer \
+    && rm -rf /etc/php7/php-fpm.d/www.conf \
+    && sed -i 's/post_max_size.*/post_max_size = 10M/' /etc/php7/php.ini \
+    && sed -i 's/upload_max_filesize.*/upload_max_filesize = 10M/' /etc/php7/php.ini
+
+
+WORKDIR /var/www
+RUN curl -L https://github.com/shaarli/Shaarli/archive/master.tar.gz | tar xzf - \
+    && mv Shaarli-master shaarli \
+    && cd shaarli \
+    && composer --prefer-dist --no-dev install \
+    && rm -rf ~/.composer \
+    && chown -R nginx:nginx .
+
+VOLUME /var/www/shaarli/data
+
+EXPOSE 80
+
+ENTRYPOINT ["/bin/s6-svscan", "/etc/services.d"]
+CMD []