diff --git a/.dockerignore b/.dockerignore
index 97a55228..6f3a0a8c 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -26,3 +26,4 @@
 **.editorconfig
 **.gitattributes
 **.gitignore
+**.md
diff --git a/infra/docker/mysql/Dockerfile b/infra/docker/mysql/Dockerfile
index c1a0c625..5610a337 100644
--- a/infra/docker/mysql/Dockerfile
+++ b/infra/docker/mysql/Dockerfile
@@ -2,6 +2,8 @@ FROM mysql/mysql-server:8.0
 
 ENV TZ=UTC
 
-RUN mkdir /var/log/mysql \
-  && chown mysql:mysql $_ \
-  && chmod 777 $_
+RUN <<EOF
+  mkdir /var/log/mysql
+  chown mysql:mysql $_
+  chmod 777 $_
+EOF
diff --git a/infra/docker/php/Dockerfile b/infra/docker/php/Dockerfile
index 56eb8e97..863bdfe3 100644
--- a/infra/docker/php/Dockerfile
+++ b/infra/docker/php/Dockerfile
@@ -14,37 +14,43 @@ ENV TZ=UTC \
 
 COPY --from=composer:2.6 /usr/bin/composer /usr/bin/composer
 
-RUN apt-get update \
-  && apt-get -y install --no-install-recommends \
+RUN <<EOF
+  apt-get update
+  apt-get -y install --no-install-recommends \
     locales \
     git \
     unzip \
     libzip-dev \
     libicu-dev \
-    libonig-dev \
-  && locale-gen en_US.UTF-8 \
-  && localedef -f UTF-8 -i en_US en_US.UTF-8 \
-  && docker-php-ext-install \
+    libonig-dev
+  locale-gen en_US.UTF-8
+  localedef -f UTF-8 -i en_US en_US.UTF-8
+  docker-php-ext-install \
     intl \
     pdo_mysql \
     zip \
-    bcmath \
-  && composer config -g process-timeout 3600 \
-  && composer config -g repos.packagist composer https://packagist.org
+    bcmath
+  composer config -g process-timeout 3600
+  composer config -g repos.packagist composer https://packagist.org
+EOF
 
 FROM base AS development
 
-RUN apt-get -y install --no-install-recommends \
-    default-mysql-client \
-  && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*
+RUN <<EOF
+  apt-get -y install --no-install-recommends \
+    default-mysql-client
+  apt-get clean
+  rm -rf /var/lib/apt/lists/*
+EOF
 
 COPY ./infra/docker/php/php.development.ini /usr/local/etc/php/php.ini
 
 FROM development AS development-xdebug
 
-RUN pecl install xdebug \
-  && docker-php-ext-enable xdebug
+RUN <<EOF
+  pecl install xdebug
+  docker-php-ext-enable xdebug
+EOF
 
 COPY ./infra/docker/php/xdebug.ini /usr/local/etc/php/conf.d/xdebug.ini
 
@@ -53,9 +59,11 @@ FROM base AS deploy
 COPY ./infra/docker/php/php.deploy.ini /usr/local/etc/php/php.ini
 COPY ./src /workspace
 
-RUN composer install -q -n --no-ansi --no-dev --no-scripts --no-progress --prefer-dist \
-  && chmod -R 777 storage bootstrap/cache \
-  && php artisan optimize:clear \
-  && php artisan optimize \
-  && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*
+RUN <<EOF
+  composer install -q -n --no-ansi --no-dev --no-scripts --no-progress --prefer-dist
+  chmod -R 777 storage bootstrap/cache
+  php artisan optimize:clear
+  php artisan optimize
+  apt-get clean
+  rm -rf /var/lib/apt/lists/*
+EOF