add drone CI

.drone.yml

@@ -0,0 +1,48 @@
+kind: pipeline
+name: default
+
+steps:
+  - name: restore-cache
+    image: meltwater/drone-cache:dev
+    environment:
+      AWS_ACCESS_KEY_ID:
+        from_secret: cache_aws_access_key_id
+      AWS_SECRET_ACCESS_KEY:
+        from_secret: cache_aws_secret_access_key
+    pull: true
+    settings:
+      restore: true
+      archive_format: "gzip"
+      bucket: drone-cache
+      cache_key: '{{ .Repo.Name }}_{{ checksum "Cargo.lock" }}_{{ arch }}_{{ os }}_gzip'
+      region: garage
+      mount:
+        - 'target'
+      path_style: true
+      endpoint: https://garage.deuxfleurs.fr
+
+  - name: build
+    image: rust:buster
+    commands:
+      - apt-get update
+      - apt-get install --yes libsodium-dev
+      - cargo build
+
+  - name: rebuild-cache
+    image: meltwater/drone-cache:dev
+    environment:
+      AWS_ACCESS_KEY_ID:
+        from_secret: cache_aws_access_key_id
+      AWS_SECRET_ACCESS_KEY:
+        from_secret: cache_aws_secret_access_key
+    pull: true
+    settings:
+      rebuild: true
+      archive_format: "gzip"
+      bucket: drone-cache
+      cache_key: '{{ .Repo.Name }}_{{ checksum "Cargo.lock" }}_{{ arch }}_{{ os }}_gzip'
+      region: garage
+      mount:
+        - 'target'
+      path_style: true
+      endpoint: https://garage.deuxfleurs.fr