chore: add drone file

.drone.yml

@@ -0,0 +1,18 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+- name: build_image
+  image: gcr.io/kaniko-project/executor:v1.7.0-debug
+  environment:
+    CI_REGISTRY: git.valvin.fr
+    CI_REGISTRY_USER: valvin
+    CI_REGISTRY_IMAGE: git.valvin.fr/valvin/gemini-agate-image
+    IMAGE_TAG: latest
+  commands:
+  - echo "init registry credentials"
+  - mkdir -p /kaniko/.docker
+  - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
+  - /kaniko/executor --context ${DRONE_WORKSPACE} --dockerfile ${DRONE_WORKSPACE}/Dockerfile --destination ${CI_REGISTRY_IMAGE}:${IMAGE_TAG}