Revert "Remove buildbuddy cache (#144356) (#144490)"

This reverts commit c0986fc04e.

.buildkite/scripts/common/setup_bazel.sh

@@ -33,7 +33,18 @@ cat <<EOF >> $KIBANA_DIR/.bazelrc
 EOF
 fi
 
-if [[ "$BAZEL_CACHE_MODE" != @(gcs|none|) ]]; then
-  echo "invalid value for BAZEL_CACHE_MODE received ($BAZEL_CACHE_MODE), expected one of [gcs,none]"
+if [[ "$BAZEL_CACHE_MODE" == "buildbuddy" ]]; then
+  echo "[bazel] enabling caching with Buildbuddy"
+cat <<EOF >> $KIBANA_DIR/.bazelrc
+  build --bes_results_url=https://app.buildbuddy.io/invocation/
+  build --bes_backend=grpcs://remote.buildbuddy.io
+  build --remote_cache=grpcs://remote.buildbuddy.io
+  build --remote_timeout=3600
+  build --remote_header=x-buildbuddy-api-key=$KIBANA_BUILDBUDDY_CI_API_KEY
+EOF
+fi
+
+if [[ "$BAZEL_CACHE_MODE" != @(gcs|buildbuddy|none|) ]]; then
+  echo "invalid value for BAZEL_CACHE_MODE received ($BAZEL_CACHE_MODE), expected one of [gcs,buildbuddy,none]"
   exit 1
 fi

.buildkite/scripts/lifecycle/pre_command.sh

@@ -108,6 +108,9 @@ export KIBANA_CI_REPORTER_KEY
   export TEST_FAILURES_ES_PASSWORD
 }
 
+KIBANA_BUILDBUDDY_CI_API_KEY=$(retry 5 5 vault read -field=value secret/kibana-issues/dev/kibana-buildbuddy-ci-api-key)
+export KIBANA_BUILDBUDDY_CI_API_KEY
+
 # By default, all steps should set up these things to get a full environment before running
 # It can be skipped for pipeline upload steps though, to make job start time a little faster
 if [[ "${SKIP_CI_SETUP:-}" != "true" ]]; then

.buildkite/scripts/steps/on_merge_ts_refs_api_docs.sh

@@ -2,6 +2,7 @@
 
 set -euo pipefail
 
+export BAZEL_CACHE_MODE=buildbuddy # Populate Buildbuddy bazel remote cache for linux
 export BUILD_TS_REFS_CACHE_ENABLE=true
 export BUILD_TS_REFS_CACHE_CAPTURE=true
 export DISABLE_BOOTSTRAP_VALIDATION=true

src/dev/ci_setup/load_env_keys.sh

@@ -34,6 +34,9 @@ else
   PERCY_TOKEN=$(retry 5 vault read -field=value secret/kibana-issues/dev/percy)
   export PERCY_TOKEN
 
+  KIBANA_BUILDBUDDY_CI_API_KEY=$(retry 5 vault read -field=value secret/kibana-issues/dev/kibana-buildbuddy-ci-api-key)
+  export KIBANA_BUILDBUDDY_CI_API_KEY
+
   # remove vault related secrets
   unset VAULT_ROLE_ID VAULT_SECRET_ID VAULT_TOKEN VAULT_ADDR
 fi