Documented deployment scripts

deploy/README.md

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+# Deploying to Production
+
+```
+workon blender-cloud  # activate your virtualenv
+cd $projectdir/deploy
+./full-pull.sh
+```
+
+## The Details
+
+Deployment consists of a few steps:
+
+1. Populate a staging directory with the files from the production branches of the various projects.
+2. Create Docker images.
+3. Push the docker images to Docker Hub.
+4. Pull the docker images on the production server and rebuild+restart the containers.
+
+The scripts involved are:
+
+- `2docker.sh`: performs step 1. above.
+- `build-{xxx}.sh`: performs steps 2. and 3. above.
+- `2server.sh`: performs step 4. above.
+
+The `full-{xxx}.sh` scripts perform all the steps, and call into `build-{xxx}.sh`.
+
+For `xxx` there are:
+
+- `all`: Rebuild all Docker images from scratch. This is good for getting the latest updates to the
+  base image.
+- `pull`: Pull the base and intermediate images from Docker Hub so that they are the same as the
+  last time someone pushed to production, then rebuilds the final Docker image.
+- `quick`: Just rebuild the final Docker image. Only use this if the last time a deployment to
+  the production server was done was by you, on the machine you're working on now.
+
+
+## Hacking Stuff
+
+To deploy another branch than `production`, do `export DEPLOY_BRANCH=otherbranch` before starting
+the above commands.