allow-specifying-base-image

[samhotep]

Allow dotrun users to specify an image or release for the dotrun docker container. The image supplied can also be a local image.

Done

• Added --image flag
• Added --release flag
• Added refresh option to re-download the latest dotrun image

QA

• Create a new virtualenv
• Checkout this branch and install dotrun using

chmod +x build.sh
./build.sh

• Download the latest dotrun image

dotrun refresh

• Change directory to an existing website, such as ubuntu.com and run dotrun with the --release flag

dotrun clean
dotrun --release latest install
dotrun --release latest serve

• Also run with the --image flag

You can create a new local dotrun image using the following

docker pull origin canonicalwebteam/dotrun-image:latest
docker tag canonicalwebteam/dotrun-image:latest canonicalwebteam/dotrun-image:testimage

And then specify the new local image

dotrun clean
dotrun --image canonicalwebteam/dotrun-image:testimage install
dotrun --image canonicalwebteam/dotrun-image:testimage serve

[edlerd]

General idea and implementation LGTM

Some comments and ideas to improve readability.