copy files over to example repo

.drone.yml

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+---
+kind: pipeline
+type: kubernetes
+name: build
+
+trigger:
+  event: [ push ]
+  branch: [ master ]
+
+steps:
+- name: build
+  # See: https://plugins.drone.io/plugins/docker
+  image: plugins/docker
+  settings:
+    registry: https://docker.internal.example.com
+    username: drone
+    password:
+      from_secret: docker-internal-password
+    repo: docker.internal.example.com/docker
+    cache_from: docker.internal.example.com/docker:ci
+    build_args: ARCH=arm64
+    tags:
+    - "ci"
+
+---
+kind: pipeline
+type: kubernetes
+name: publish
+
+trigger:
+  event: [ promote ]
+  target: [ publish ]
+
+steps:
+- name: build-and-publish
+  # See: https://plugins.drone.io/plugins/docker
+  image: plugins/docker
+  settings:
+    registry: https://docker.internal.example.com
+    username: drone
+    password:
+      from_secret: docker-internal-password
+    repo: docker.internal.example.com/docker
+    cache_from: docker.internal.example.com/docker:ci
+    build_args: ARCH=arm64
+    tags:
+    - "latest"

Dockerfile

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+
+FROM alpine:3.14
+
+ENV DOCKER_HOST=unix:///var/run/docker.sock
+
+RUN apk --no-cache add --update docker openrc bash
+RUN rc-update add docker boot
+
+COPY docker-setup /bin/
+RUN chmod +x /bin/docker-setup
+
+COPY docker-remote-tag /bin/
+RUN chmod +x /bin/docker-remote-tag
+
+CMD [ "/bin/docker-setup" ]
+ENTRYPOINT [ "/bin/bash", "-l", "-c" ]

docker-remote-tag

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+#!/bin/bash
+
+# Tags an already existing image version in a remote registry without needing to pull/push the whole image
+# 
+# Usage:
+#  /bin/docker-remote-tag <repo-name> <existing-tag> <new-tag>
+# 
+
+REPOSITORY="$1"
+TAG_OLD="$2"
+TAG_NEW="$3"
+
+CONTENT_TYPE="application/vnd.docker.distribution.manifest.v2+json"
+
+MANIFEST=$(curl -H "Accept: ${CONTENT_TYPE}" "${DOCKER_REGISTRY}/v2/${REPOSITORY}/manifests/${TAG_OLD}")
+
+curl -X PUT -H "Content-Type: ${CONTENT_TYPE}" -d "${MANIFEST}" "${DOCKER_REGISTRY}/v2/${REPOSITORY}/manifests/${TAG_NEW}"

docker-setup

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+#!/bin/bash
+
+docker login --username "${DOCKER_USER}" --password "${DOCKER_PASS}" "${DOCKER_REGISTRY}"

readme.md

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+
+## `docker` image
+
+An `alpine` image with `docker` installed
+
+See https://blog.jbrumond.me/post/raspberry-pi-cluster-part-4:-gitea-and-drone for more info
+
+
+
+### Drone CI Usage
+
+```yaml
+steps:
+- name: deploy
+  image: docker.internal.example.com/docker
+  volumes:
+  - name: dockersock
+    path: /var/run/
+  environment:
+    DOCKER_REGISTRY: https://docker.internal.example.com
+    DOCKER_USER: drone
+    DOCKER_PASS:
+      from_secret: docker-internal-password
+  commands:
+  - /bin/docker-setup
+  - docker tag ...
+  - docker push ...
+volumes:
+- name: dockersock
+  host:
+    path: /var/run/
+```