Updated CI configuration

Dockerfile

@@ -0,0 +1,41 @@
+FROM debian:stretch
+MAINTAINER Gregorio Chiko <gregorio@lepisi.ac.id>
+
+RUN apt-get update && \
+    apt-get install -y \
+    apt-transport-https \
+    lsb-release \
+    ca-certificates \
+    curl \
+    git \
+    zip \
+    unzip \
+    sudo \
+    wget \
+    gnupg1
+
+ADD https://packages.sury.org/php/apt.gpg /etc/apt/trusted.gpg.d/php.gpg
+RUN sh -c 'echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'
+RUN chmod 664 /etc/apt/trusted.gpg.d/php.gpg
+
+RUN apt-get update && \
+    apt-get install -y \
+    php7.2-fpm \
+    php7.2-cli \
+    php7.2-mysql \
+    php7.2-mbstring \
+    php7.2-json \
+    php7.2-sqlite3 \
+    php7.2-xml \
+    php7.2-curl \
+    php7.2-zip \
+    php7.2-intl \
+    php7.2-gd \
+    php7.2-bz2 \
+    php7.2-opcache
+
+COPY --from=composer:1.5 /usr/bin/composer /usr/bin/composer
+
+RUN php -v && \
+    git --version && \
+    composer --version