Required for bootstrapping bazel stamping since we cannot use "bazel build" during the workspace_status command.
Adds a small script that builds the pseudo-version tool in bazel (without stamping) and uploads it to the mirror.
On the first bazel build with stamping, the pseudo-version tool is downloaded.
* bazel: add configuration for remote caching
* ci: enable bazel remote caching for building binaries
* ci: use bazel directly when building go binaries
* ci: enable cache for most build steps
* dev-docs: document remote caching
