feat: docker image

.dockerignore

@@ -0,0 +1,3 @@
+*
+
+!/wait-for-it.sh

.drone.yml

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+---
+kind: pipeline
+type: docker
+name: default
+
+trigger:
+  event:
+  - push
+
+steps:
+- name: docker
+  image: plugins/docker
+  settings:
+    username:
+      from_secret: REGISTRY_USERNAME
+    password:
+      from_secret: REGISTRY_PASSWORD
+    repo: grachevko/wait-for-it
+    tags: latest
+  when:
+    branch:
+    - master
+    - rc

Dockerfile

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+FROM alpine:3.17.2
+
+RUN --mount=type=cache,target=/var/cache/apk \
+    set -e \
+    && apk add --update-cache \
+      bash
+
+COPY wait-for-it.sh /bin/
+
+ENTRYPOINT ["/bin/wait-for-it.sh"]