add amazonlinux DockerFile and related test changes

docker/release/amazonlinux/Dockerfile

@@ -0,0 +1,28 @@
+# Docker image file that describes an Centos7 image with PowerShell installed from Microsoft YUM Repo
+
+FROM amazonlinux:latest
+
+LABEL maintainer="PowerShell Team <powershellteam@hotmail.com>"
+LABEL readme.md="https://github.com/PowerShell/PowerShell/blob/master/docker/README.md"
+LABEL description="This Dockerfile will install the latest release of PS."
+
+# Setup the locale
+ENV LANG en_US.UTF-8
+ENV LC_ALL $LANG
+RUN localedef --charmap=UTF-8 --inputfile=en_US $LANG
+
+# Install dependencies and clean up
+RUN yum install -y \       
+        curl \
+    && yum clean all
+
+# Download and configure Microsoft Repository config file
+RUN curl https://packages.microsoft.com/config/rhel/7/prod.repo | tee /etc/yum.repos.d/microsoft.repo
+
+# Install latest powershell from Microsoft YUM Repo
+RUN yum install -y \
+        powershell
+
+# Use PowerShell as the default shell
+# Use array to avoid Docker prepending /bin/sh -c
+CMD [ "powershell" ]

docker/tests/containerTestCommon.psm1

@@ -65,7 +65,7 @@ function Invoke-Docker
 # Return a list of Linux Container Test Cases
 function Get-LinuxContainer
 {
-    foreach($os in 'centos7','opensuse42.1','ubuntu14.04','ubuntu16.04')
+    foreach($os in 'amazonlinux','centos7','opensuse42.1','ubuntu14.04','ubuntu16.04')
     {
         Write-Output @{
             Name = $os