Add initial runner configuration

.env.sample

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+RPC_PROTO=https
+RPC_HOST=drone.halia.dev
+RPC_SECRET=
+RUNNER_CAPACITY=1

.gitignore

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+.env

docker-compose.yml

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+services:
+    drone-runner:
+        container_name: drone-runner
+        image: drone/drone-runner-docker:1
+        environment:
+          - DRONE_RPC_PROTO={{RPC_PROTO}}
+          - DRONE_RPC_HOST={{RPC_HOST}}
+          - DRONE_RPC_SECRET={{RPC_SECRET}}
+          - DRONE_RUNNER_CAPACITY={{RUNNER_CAPACITY}}
+          - DRONE_RUNNER_NAME=${HOSTNAME}
+        volumes:
+          - /var/run/docker.sock:/var/run/docker.sock
+          - /opt/services:/opt/services
+        restart: unless-stopped
+        ports:
+          - 3030:3000
+