Add Docker scripts

Common bootstrap.ps1 script to run PowerShell builds.
Launch script to build and tag all containers.
Test script to run tests in unstable containers.

docker/launch.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+set -e
+
+# Build both sets by default
+if [[ -z "$BUILDS" ]]; then
+    BUILDS="stable unstable"
+fi
+
+# Build specified distributions
+if [[ -z $DISTROS ]]; then
+    DISTROS="ubuntu14.04"
+fi
+
+for build in $BUILDS; do
+    # cd so $distro is only the distro name
+    cd $build
+    for distro in $DISTROS; do
+        echo "Building $build/$distro"
+        # copy the common script because it lives outside the docker build context
+        if [[ "$build" = "unstable" ]]; then
+            cp bootstrap.ps1 $distro
+        fi
+        # build and tag the image so they can be derived from
+        docker build -t powershell/powershell:$build-$distro $distro
+    done
+    cd ..
+done

docker/test.sh

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+#!/usr/bin/env bash
+
+set -e
+
+# Build specified distributions
+if [[ -z $DISTROS ]]; then
+    DISTROS="ubuntu14.04 ubuntu16.04 centos7"
+fi
+
+build=unstable
+command="cd PowerShell; Import-Module ./build.psm1; Start-PSPester"
+
+cd $build
+for distro in $DISTROS; do
+    echo "Testing $build/$distro"
+    # Run Pester tests inside container
+    docker run -it powershell/powershell:$build-$distro powershell -c "$command"
+done
+cd ..

docker/unstable/.gitignore

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+*/bootstrap.ps1

docker/unstable/bootstrap.ps1

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+# This is intended to be used inside Docker containers
+
+git clone --recursive https://github.com/PowerShell/PowerShell.git
+Set-Location PowerShell
+Import-Module ./build.psm1
+Start-PSBootstrap -Package -NoSudo
+Start-PSBuild -Crossgen
+Start-PSPackage