gh-40089: Meson: test void linux on CI and add devcontainer for it
    
<!-- ^ Please provide a concise and informative title. -->
<!-- ^ Don't put issue numbers in the title, do this in the PR
description below. -->
<!-- ^ For example, instead of "Fixes #12345" use "Introduce new method
to calculate 1 + 2". -->
<!-- v Describe your changes below in detail. -->
<!-- v Why is this change required? What problem does it solve? -->
<!-- v If this PR resolves an open issue, please link to it here. For
example, "Fixes #12345". -->

Add a CI test for Void Linux building sage with meson (similar to #40038
for Fedora). A few minor bugs in the system package installation are
fixed: a missing `--yes` for the package index update, and adding a few
missing void packages.

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [ ] The title is concise and informative.
- [ ] The description explains in detail what this PR is about.
- [ ] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - #12345: short description why this is a dependency -->
<!-- - #34567: ... -->
    
URL: #40089
Reported by: Tobias Diez
Reviewer(s): Dima Pasechnik, Tobias Diez

Author: Release Manager

.devcontainer/portability-void/Dockerfile

@@ -0,0 +1,3 @@
+FROM ghcr.io/void-linux/void-glibc-full
+RUN xbps-install -Suy bash git python
+RUN chsh -s /usr/bin/bash

.devcontainer/portability-void/devcontainer.json

@@ -0,0 +1,24 @@
+// See https://aka.ms/devcontainer.json for format details.
+{
+    "name": "void",
+    // Doesn't include 'bash', so we use a custom dockerfile
+    // "image": "ghcr.io/void-linux/void-glibc-full",
+    "dockerFile": "Dockerfile",
+    "onCreateCommand": ".devcontainer/onCreate-meson.sh || true",
+    "features": {
+        // Git feature is not compatible with Void Linux, so we install it manually in the Dockerfile 
+        // https://github.com/devcontainers/features/issues/824
+        //"ghcr.io/devcontainers/features/git": {},
+        //"ghcr.io/devcontainers/features/python:1": {},
+        "../uv": {
+			"version": "latest"
+		}
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "ms-python.python"
+            ]
+        }
+    }
+}

.github/workflows/ci.yml

@@ -22,13 +22,23 @@ jobs:
         container:
           - fedora:41
           - fedora:42
+          - ghcr.io/void-linux/void-glibc-full
           #- ubuntu:22.04 - fails due to issue with cypari2
           #- ubuntu:24.04 - fails due to issue with cypari2
           - ubuntu:25.04
     container:
       image: ${{ matrix.container }}
 
     steps:
+      - name: Prepare container
+        run: |
+          if [ "${{ matrix.container }}" = "ghcr.io/void-linux/void-glibc-full" ]; then
+            xbps-install -Syu xbps
+            xbps-install -yu
+            # node-based actions require libstdc++.so.6
+            xbps-install -Sy libstdc++ bash git
+          fi
+
       - name: Checkout code
         # cannot use v4 yet because of https://github.com/actions/checkout/issues/1487
         uses: actions/checkout@v3
@@ -85,10 +95,10 @@ jobs:
         id: clear-container-name
         if: failure() || success()
         run: |
-          # Output the container name, but with ":" replaced by "-"
-          # This is needed to avoid issues with the upload-artifact action
-          CONTAINER_NAME=$(echo "${{ matrix.container }}" | tr ':' '-')
-          echo "CONTAINER_NAME=$CONTAINER_NAME" >> $GITHUB_OUTPUT
+            # Output the container name, but with ":" and "/" replaced by "-"
+            # This is needed to avoid issues with the upload-artifact action
+            CONTAINER_NAME=$(echo "${{ matrix.container }}" | tr ':/' '--')
+            echo "CONTAINER_NAME=$CONTAINER_NAME" >> $GITHUB_OUTPUT
 
       - name: Upload log
         uses: actions/upload-artifact@v4.5.0

build/bin/sage-print-system-package-command

@@ -172,7 +172,7 @@ case $system:$command in
         fi
         ;;
     void*:update)
-        print_shell_command "${SUDO}xbps-install -Su"
+        print_shell_command "${SUDO}xbps-install -Suy"
         ;;
     void*:install)
         [ "$YES" = yes ] && options="$options --yes"

build/pkgs/elliptic_curves/arch.txt renamed to build/pkgs/elliptic_curves/distros/arch.txt

@@ -0,0 +1 @@
+sage-data-elliptic_curves

build/pkgs/elliptic_curves/distros/void.txt

@@ -0,0 +1 @@
+gap-devel