add basic dockerfile and woodpecker configuration

.woodpecker.yml

@@ -0,0 +1,15 @@
+pipeline:
+  build:
+    image: docker
+    commands:
+      - apk add curl
+      - docker login -u $DOCKER_USERNAME -p $DOCKER_PASSWORD registry.yetaga.in
+      - docker build -t registry.yetaga.in/bookstores:latest .
+      - docker push registry.yetaga.in/bookstores:latest
+      - 'curl http://172.17.0.1:4000/api/fetch -H "Authorization: Bearer $COMPOSE_TOKEN"'
+      - 'curl http://172.17.0.1:4000/api/update -H "Authorization: Bearer $COMPOSE_TOKEN"'
+    secrets: [docker_username, docker_password, compose_token]
+    when:
+      branch: "master"
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock