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Bumps to Alpine 3.20.2
Signed-off-by: Adrian Cole <adrian.cole@elastic.co>
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Dockerfile

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# When updating, update the README and the alpine_version ARG
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# * Use current version from https://alpinelinux.org/downloads/
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# * ARGs repeat because Dockerfile ARGs are layer specific but will reuse the value defined here.
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ARG alpine_version=3.20.0
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ARG alpine_version=3.20.2
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# We copy files from the context into a scratch container first to avoid a problem where docker and
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# docker-compose don't share layer hashes https://github.com/docker/compose/issues/883 normally.
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# See from a previously published version to avoid pulling from Docker Hub (docker.io)
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# This version is only used to install the real version
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FROM ghcr.io/openzipkin/alpine:3.18.5 as install
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FROM ghcr.io/openzipkin/alpine:3.20.0 as install
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WORKDIR /code
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# Conditions aren't supported in Dockerfile instructions, so we copy source even if it isn't used.

README.md

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To browse the image, run it in interactive mode with TTY enabled like so:
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```bash
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docker run -ti --rm ghcr.io/openzipkin/alpine:3.20.0
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docker run -ti --rm ghcr.io/openzipkin/alpine:3.20.2
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/ #
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```
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## Release process
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Build the `Dockerfile` using the current version from https://alpinelinux.org/downloads/:
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```bash
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# Note 3.20.0 not 3.19!
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./build-bin/build 3.20.0
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# Note 3.20.2 not 3.19!
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./build-bin/build 3.20.2
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```
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Next, verify the built image matches that version:
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```bash
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docker run --rm openzipkin/alpine:test -c 'cat /etc/alpine-release'
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3.20.0
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3.20.2
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```
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To release the image, push a tag matching the arg to `build-bin/build` (ex `3.20.0`).
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To release the image, push a tag matching the arg to `build-bin/build` (ex `3.20.2`).
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This triggers a [GitHub Actions](https://github.com/openzipkin/docker-alpine/actions) job to push the image.

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