Add Docker

tools/docker/composer/Dockerfile

@@ -0,0 +1,26 @@
+FROM php:7.4-cli
+
+COPY tools/docker/composer/composer-installer.sh /usr/local/bin/composer-installer
+
+RUN apt-get -yqq update \
+  && apt-get -yqq install --no-install-recommends \
+    git \
+    libpng-dev \
+    unzip \
+    wget \
+    zip \
+  && apt-get autoremove -y --purge \
+  && rm -fr /var/lib/apt/lists/* \
+  && chmod +x /usr/local/bin/composer-installer \
+  && composer-installer \
+  && mv composer.phar /usr/local/bin/composer \
+  && chmod +x /usr/local/bin/composer \
+  && composer --version
+
+RUN docker-php-ext-install gd
+
+COPY . /app
+
+WORKDIR /app
+
+ENTRYPOINT [ "/usr/local/bin/composer" ]