Meson: test void linux on CI and add devcontainer for it

.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

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/distros/void.txt

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

build/pkgs/gap/distros/void.txt

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