updates for multi-arch builds

.drone.yml

@@ -1,45 +1,21 @@
 ---
-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://gitea.internal.example.com
-    username: drone
-    password:
-      from_secret: gitea-internal-password
-    repo: gitea.internal.example.com/examples/docker
-    cache_from: gitea.internal.example.com/examples/docker:ci
+kind: template
+load: multiarch-container.yaml
+data:
+  repo: images/docker
+  # because this *is* the docker image, the "latest" tag hasn't been published yet (that's
+  # what we're about to do), so we need to pick a specific arch image.
+  # todo: is there some way to choose this value automatically to match the runner?
+  docker_image_tag: latest-linux-arm64
+  build_args:
+  # `apk info docker` to get latest version
+  - DOCKER_VERSION=20.10.21-r1
   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://gitea.internal.example.com
-    username: drone
-    password:
-      from_secret: gitea-internal-password
-    repo: gitea.internal.example.com/examples/docker
-    cache_from: gitea.internal.example.com/examples/docker:ci
-    tags:
-    - "latest"
+  - "20.10.21"
+  - "20.10"
+  - "20"
+  platforms:
+  - os: linux
+    arch: arm64
+  # - os: linux
+  #   arch: amd64

Dockerfile

@@ -1,13 +1,19 @@
 
-FROM alpine:3.16
+FROM alpine:3.17
 
 ENV DOCKER_HOST=unix:///var/run/docker.sock
 
-RUN apk --no-cache add --update docker openrc bash
+ARG DOCKER_VERSION
+
+RUN apk --no-cache add --update \
+	docker=$DOCKER_VERSION \
+	openrc \
+	bash
+
 RUN rc-update add docker boot
 
-COPY docker-setup /
-RUN chmod +x /docker-setup
+COPY docker-setup /bin/
+RUN chmod +x /bin/docker-setup
 
-CMD [ "/docker-setup" ]
+CMD [ "/bin/docker-setup" ]
 ENTRYPOINT [ "/bin/bash", "-l", "-c" ]