Add DroneCI config for build Docker image

.drone.yml

@@ -0,0 +1,36 @@
+kind: pipeline
+name: default
+
+steps:
+- name: build tagged docker image
+  image: plugins/docker
+  settings:
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password
+    dockerfile: Dockerfile
+    repo: evolix/ansible-roles
+    auto_tag: true
+  environment:
+    ROLES_VERSION: $DRONE_COMMIT_SHA
+  when:
+    event:
+    - tag
+
+- name: build latest docker image
+  image: plugins/docker
+  settings:
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password
+    dockerfile: Dockerfile
+    repo: evolix/ansible-roles
+    tags: latest
+  environment:
+    ROLES_VERSION: $DRONE_COMMIT_SHA
+  when:
+    branch:
+    - unstable
+

Dockerfile

@@ -0,0 +1,20 @@
+FROM debian:stretch-slim
+
+ENV ROLES_VERSION=${ROLES_VERSION:-unstable}
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        git \
+	ansible \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN ansible-galaxy install --force \
+    --roles-path /etc/ansible \
+    "git+https://gitea.evolix.org/evolix/ansible-roles.git,${ROLES_VERSION},roles"
+
+ENV ANSIBLE_FORCE_COLOR=1
+ENV ANSIBLE_HOST_KEY_CHECKING=false
+ENV ANSIBLE_RETRY_FILES_ENABLED=false
+ENV PYTHONUNBUFFERED=1
+
+ENTRYPOINT ["ansible-playbook"]