Dependabot suggests changing distro from alpine to ubuntu

[gmile]

Is there an existing issue for this?

• I have searched the existing issues

Package ecosystem

Docker

Package manager version

No response

Language version

Dockerfile

Manifest location and content before the Dependabot update

Dockerfile (can't share the content)

dependabot.yml content

version: 2
updates:
  - package-ecosystem: "mix"
    directory: "/"
    schedule:
      interval: "weekly"

  - package-ecosystem: "docker"
    directory: "/"
    schedule:
      interval: "weekly"

Updated dependency

From:

hexpm/elixir:1.18.1-erlang-27.2-alpine-3.21.0

To:

hexpm/elixir:1.18.1-erlang-27.2-ubuntu-noble-20241118.1

What you expected to see, versus what you actually saw

I expected an upgrade from:

hexpm/elixir:1.18.1-erlang-27.2-alpine-3.21.0

...to a recent Alpine patch version, for example:

hexpm/elixir:1.18.1-erlang-27.2-alpine-3.21.2

Here's what I saw - this a patch submitted by dependabot:

From 99b55edae7902d9417e27beb78e3f54cf1c344ec Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Mon, 13 Jan 2025 03:30:17 +0000
Subject: [PATCH] Bump hexpm/elixir

Bumps hexpm/elixir from 1.18.1-erlang-27.2-alpine-3.21.0 to 1.18.1-erlang-27.2-ubuntu-noble-20241118.1.

---
updated-dependencies:
- dependency-name: hexpm/elixir
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
---
 Dockerfile     | 2 +-
 Dockerfile.dev | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index a7aac9a1b..1c6e09293 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM hexpm/elixir:1.18.1-erlang-27.2-alpine-3.21.0 AS build
+FROM hexpm/elixir:1.18.1-erlang-27.2-ubuntu-noble-20241118.1 AS build
 WORKDIR /app
 RUN apk add --update git libc-dev gcc make
 ENV MIX_ENV=prod
diff --git a/Dockerfile.dev b/Dockerfile.dev
index 6b64e9e86..3756ac83a 100644
--- a/Dockerfile.dev
+++ b/Dockerfile.dev
@@ -1,4 +1,4 @@
-FROM hexpm/elixir:1.18.1-erlang-27.2-alpine-3.21.0 AS build
+FROM hexpm/elixir:1.18.1-erlang-27.2-ubuntu-noble-20241118.1 AS build
 WORKDIR /app
 RUN apk add --update git libc-dev gcc make
 ENV MIX_ENV=dev

Native package manager behavior

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Images of the diff or a link to the PR, issue, or logs

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Smallest manifest that reproduces the issue

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