CI: Add support for buildbuddy uploads (#12378)

* Add build metadata

* Add buildbuddy flags

* more metadata

* fix latest tag

* fix branch

* revert branch change

* touch a file to trigger build

* remove unknown command

* fix script

* Update latest_version_tag.sh

.buildkite-bazelrc

@@ -43,4 +43,12 @@ build --flaky_test_attempts=5
 
 # Better caching
 build:nostamp --nostamp
-build:nostamp --workspace_status_command=./hack/workspace_status_ci.sh
+
+# Build metadata
+build --build_metadata=ROLE=CI
+build --build_metadata=REPO_URL=https://github.com/prysmaticlabs/prysm.git
+build --workspace_status_command=./hack/workspace_status_ci.sh
+
+# Buildbuddy
+build --bes_results_url=https://app.buildbuddy.io/invocation/
+build --bes_backend=grpcs://remote.buildbuddy.io

hack/latest_version_tag.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -e
+
+# Prints the latest git version tag, like "v2.12.8"
+git tag -l 'v*' --sort=creatordate |
+    perl -nle 'if (/^v\d+\.\d+\.\d+$/) { print $_ }' |
+    tail -n1
+

hack/workspace_status_ci.sh

@@ -1,9 +1,20 @@
 #!/bin/bash
 
-# Note: The STABLE_ prefix will force a relink when the value changes when using rules_go x_defs.
+repo_url=$(git config --get remote.origin.url)
+echo "REPO_URL $repo_url"
 
-echo STABLE_GIT_COMMIT "continuous-integration"
-echo DATE "now"
-echo DATE_UNIX "0"
-echo DOCKER_TAG "ci-foo"
-echo STABLE_GIT_TAG "c1000deadbeef"
+commit_sha=$(git rev-parse HEAD)
+echo "COMMIT_SHA $commit_sha"
+
+echo "GIT_BRANCH $git_branch"
+
+git_tree_status=$(git diff-index --quiet HEAD -- && echo 'Clean' || echo 'Modified')
+echo "GIT_TREE_STATUS $git_tree_status"
+
+# Note: the "STABLE_" suffix causes these to be part of the "stable" workspace
+# status, which may trigger rebuilds of certain targets if these values change
+# and you're building with the "--stamp" flag.
+latest_version_tag=$(./hack/latest_version_tag.sh)
+echo "STABLE_VERSION_TAG $latest_version_tag"
+echo "STABLE_COMMIT_SHA $commit_sha"
+echo "STABLE_GIT_TAG $latest_version_tag"