Use BK cache plugin

# Conflicts:
#	.buildkite/pipeline.yml

# Conflicts:
#	.buildkite/pipeline.yml

Author: v1v

.buildkite/pipeline.yml

@@ -11,6 +11,27 @@ env:
   IMAGE_WIN_2022: "platform-ingest-elastic-agent-windows-2022-1761958868"
   IMAGE_WIN_10: "platform-ingest-elastic-agent-windows-10-1761958868"
   IMAGE_WIN_11: "platform-ingest-elastic-agent-windows-11-1761958868"
+  BUILDKITE_PLUGIN_S3_CACHE_BUCKET: "elastic-agent-ci-go-cache"
+  BUILDKITE_PLUGIN_S3_CACHE_PREFIX: "elastic-agent-test"
+
+common:
+- aws_oidc: &aws_oidc
+    # See https://github.com/elastic/oblt-infra/blob/main/conf/resources/repos/elastic-agent/01-aws-buildkite-oidc.tf
+    elastic/oblt-aws-auth#v0.2.0:
+- base_cache_settings: &base_cache_settings
+    manifest: go.sum
+    backend: s3
+    restore: all
+    save: file
+    compression: zstd
+- cache_unix: &cache_unix
+    cache#v1.8.0:
+      <<: *base_cache_settings
+      path: /opt/buildkite-agent/.cache/go-build
+- cache_windows: &cache_windows
+    cache#v1.8.0:
+      <<: *base_cache_settings
+      path: C:\Users\buildkite\AppData\Local\go-build
 
 steps:
   - label: "check-ci"
@@ -38,6 +59,9 @@ steps:
           provider: "gcp"
           image: "${IMAGE_UBUNTU_2204_X86_64}"
           machineType: "n2-standard-8"
+        plugins:
+          - *aws_oidc
+          - *cache_unix
         retry:
           automatic:
             limit: 1