Linting

Fixes #1

.hadolint.yaml

+ignored:
+  - DL3007
+  - DL3008

golang/latest/Dockerfile

 # Base image: https://hub.docker.com/_/golang/
 FROM golang:latest
-MAINTAINER ethitter
+
+LABEL maintainer="ethitter"
+LABEL version="1.0"
 
 # Install golint
 ENV GOPATH /go
@@ -8,9 +10,11 @@ ENV PATH ${GOPATH}/bin:$PATH
 RUN go get -u github.com/golang/lint/golint
 
 # Add apt key for LLVM repository
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
 
 # Add LLVM apt repository
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN echo "deb http://apt.llvm.org/stretch/ llvm-toolchain-stretch-5.0 main" | tee -a /etc/apt/sources.list
 
 # Install clang from LLVM repository
@@ -21,4 +25,5 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 # Set Clang as default CC
 ENV set_clang /etc/profile.d/set-clang-cc.sh
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN echo "export CC=clang-5.0" | tee -a ${set_clang} && chmod a+x ${set_clang}

php/5.3/Dockerfile

 FROM tetraweb/php:5.3
-MAINTAINER ethitter
 
-RUN apt-get update && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev libmysqlclient-dev libfreetype6-dev libjpeg-dev libxpm-dev --fix-missing
+LABEL maintainer="ethitter"
+LABEL version="1.0"
+
+RUN apt-get update \
+    && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev libmysqlclient-dev libfreetype6-dev libjpeg-dev libxpm-dev --fix-missing --no-install-recommends \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
 RUN docker-php-ext-install mbstring mysqli intl gd zip bz2
 
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 RUN chmod +x /usr/local/bin/composer
 

php/5.6/Dockerfile

 FROM php:5.6-stretch
-MAINTAINER ethitter
 
-RUN apt-get update && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev default-libmysqlclient-dev --fix-missing
+LABEL maintainer="ethitter"
+LABEL version="1.0"
+
+RUN apt-get update \
+    && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev default-libmysqlclient-dev --fix-missing --no-install-recommends \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
 RUN docker-php-ext-install mbstring mysqli intl gd zip bz2
 
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 RUN chmod +x /usr/local/bin/composer
 

php/7.0/Dockerfile

 FROM php:7.0-stretch
-MAINTAINER ethitter
 
-RUN apt-get update && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev default-libmysqlclient-dev --fix-missing
+LABEL maintainer="ethitter"
+LABEL version="1.0"
+
+RUN apt-get update \
+    && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev default-libmysqlclient-dev --fix-missing --no-install-recommends \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
 RUN docker-php-ext-install mbstring mysqli intl gd zip bz2
 
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 RUN chmod +x /usr/local/bin/composer
 

php/7.1/Dockerfile

 FROM php:7.1-stretch
-MAINTAINER ethitter
 
-RUN apt-get update && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev default-libmysqlclient-dev --fix-missing
+LABEL maintainer="ethitter"
+LABEL version="1.0"
+
+RUN apt-get update \
+    && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev default-libmysqlclient-dev --fix-missing --no-install-recommends \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
 RUN docker-php-ext-install mbstring mysqli intl gd zip bz2
 
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 RUN chmod +x /usr/local/bin/composer
 

php/7.2/Dockerfile

 FROM php:7.2-stretch
-MAINTAINER ethitter
 
-RUN apt-get update && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev default-libmysqlclient-dev --fix-missing
+LABEL maintainer="ethitter"
+LABEL version="1.0"
+
+RUN apt-get update \
+    && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev default-libmysqlclient-dev --fix-missing --no-install-recommends \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
 RUN docker-php-ext-install mbstring mysqli intl gd zip bz2
 
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 RUN chmod +x /usr/local/bin/composer
 

php/7.3/Dockerfile

 FROM php:7.3-stretch
-MAINTAINER ethitter
 
-RUN apt-get update && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev default-libmysqlclient-dev libzip-dev --fix-missing
+LABEL maintainer="ethitter"
+LABEL version="1.0"
+
+RUN apt-get update \
+    && apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev default-libmysqlclient-dev libzip-dev --fix-missing --no-install-recommends \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
 RUN docker-php-ext-install mbstring mysqli intl gd zip bz2
 
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 RUN chmod +x /usr/local/bin/composer