chore: add GitLab CI pipeline for Go tests

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitlab-ci.yml

@@ -0,0 +1,17 @@
+stages:
+  - test
+
+test:
+  stage: test
+  image: golang:1.24-bookworm
+  variables:
+    CGO_ENABLED: "0"
+  script:
+    - go test ./pkg/orm/... ./pkg/server/... -v -count=1
+  cache:
+    key: "$CI_COMMIT_REF_SLUG"
+    paths:
+      - .go-cache/
+  before_script:
+    - mkdir -p .go-cache
+    - export GOPATH="$CI_PROJECT_DIR/.go-cache"