Add Drone CI

.drone.yml

@@ -0,0 +1,17 @@
+kind: pipeline
+type: docker
+name: test
+platform:
+  os: linux
+  arch: amd64
+trigger:
+  branch:
+  - cpp
+steps:
+- name: test
+  image: git.sainnhe.dev/sainnhe/gcc:latest
+  commands:
+    - apk add cmake make
+    - cmake .
+    - make -j$(nproc)
+    - ctest