ci: add pipeline for build and test

.gitlab-ci.yml

@@ -0,0 +1,16 @@
+stages:
+  - primary
+
+build-and-test:
+  stage: primary
+  image: rust:1.74.0
+  tags:
+    - shared-fi
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+  script:
+    # build and test in single job for faster execution
+    # because shared runner doesn't allow caching
+    - cargo build --verbose
+    - cargo test --verbose