Dockerfile is now Dockerfile.cache which will be run approximately
weekly and will contain the cache of the current tools. New file
Dockerfile.run will start from that image and copy in the current
workspace.
Change-Id: If9c0311f7122fbed1f5e86e4d6391c0a1382765f
Bug: 216
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/15040
Reviewed-by: Johan Euphrosine <proppy@google.com>
Reviewed-by: Keir Mierle <keir@google.com>
Commit-Queue: Rob Mohr <mohrr@google.com>
