feat: BuildKit client + integration test suite (651 tests)

BuildKitClient CLI wrapper for buildctl.
Docker compose stack (9 services) for integration testing.
Comprehensive test suite: wiremock tests for Matrix/La Suite/S3/client,
integration tests for Kratos/Hydra/Gitea/OpenSearch/Prometheus/Loki/
Grafana/LiveKit.

Bump: sunbeam-sdk v0.12.0

sunbeam-sdk/tests/config/loki.yml

@@ -0,0 +1,34 @@
+auth_enabled: false
+
+server:
+  http_listen_port: 3100
+
+common:
+  ring:
+    kvstore:
+      store: inmemory
+    replication_factor: 1
+    instance_addr: 127.0.0.1
+  path_prefix: /tmp/loki
+
+ingester:
+  lifecycler:
+    ring:
+      kvstore:
+        store: inmemory
+      replication_factor: 1
+    min_ready_duration: 0s
+
+schema_config:
+  configs:
+    - from: "2020-01-01"
+      store: tsdb
+      object_store: filesystem
+      schema: v13
+      index:
+        prefix: index_
+        period: 24h
+
+storage_config:
+  filesystem:
+    directory: /tmp/loki/chunks