Merci pour le correctif ! Ça a résolu une partie du problème. Ça va plus loin, c’est du progrès. À présent j’ai un autre problème 
duniter-v2s (runtime/gtest-1100)> cargo xtask release runtime build gtest
Compiling xtask v0.1.0 (/home/moul/projects/ML/duniter-v2s/xtask)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.19s
Running `target/debug/xtask release runtime build gtest`
rustc 1.88.0 (6b00bc388 2025-06-23)
cargo 1.88.0 (873a06493 2025-05-10)
🚀 Construction du runtime avec srtool: gtest
Docker version 29.2.1, build 2.fc43
📄 SRTOOL_OUTPUT = release/srtool_output_gtest.json
🐳 Lancement du conteneur srtool...
🚀 Démarrage de srtool...
📁 Répertoire de travail: /build
🔧 Runtime: gtest
📄 Sortie: release/srtool_output_gtest.json
🔨 Construction du runtime avec srtool...
🧰 Substrate Runtime Toolbox - srtool v0.18.3 🧰
- by Chevdor -
info: override toolchain for '/build' set to '1.88.0-x86_64-unknown-linux-gnu'
info: component 'rust-std' for target 'wasm32-unknown-unknown' is up to date
info: component 'rust-src' is up to date
🏗 Building gtest-runtime as release using rustc 1.88.0 (6b00bc388 2025-06-23)
⏳ That can take a little while, be patient... subsequent builds may be faster.
Since you have to wait a little, you may want to learn more about Substrate runtimes:
https://docs.substrate.io/learn/architecture/
Updating git repository `https://github.com/duniter/duniter-polkadot-sdk`
warning: spurious network error (3 tries remaining): failed to resolve address for github.com: Temporary failure in name resolution; class=Net (12)
warning: spurious network error (2 tries remaining): failed to resolve address for github.com: Temporary failure in name resolution; class=Net (12)
warning: spurious network error (1 tries remaining): failed to resolve address for github.com: Temporary failure in name resolution; class=Net (12)
error: failed to get `frame-support` as a dependency of package `dc-distance v1.0.0 (/build/client/distance)`
Caused by:
failed to load source for dependency `frame-support`
Caused by:
Unable to update https://github.com/duniter/duniter-polkadot-sdk?branch=duniter-substrate-v1.19.1#b3107832
Caused by:
failed to clone into: /home/builder/cargo/git/db/duniter-polkadot-sdk-e5370cbca9345ad4
Caused by:
revision b310783213f03d42d155d1d054fa4f86910734c3 not found
Caused by:
network failure seems to have happened
if a proxy or similar is necessary `net.git-fetch-with-cli` may help here
https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli
Caused by:
failed to resolve address for github.com: Temporary failure in name resolution; class=Net (12)
📦 Déplacement du fichier WASM...
mv: cannot stat '/build/runtime/gtest/target/srtool/release/wbuild/gtest-runtime/gtest_runtime.compact.compressed.wasm': No such file or directory
Error: Échec de la construction du runtime avec srtool
Je vais continuer d’utiliser ma méthode pour contourner le problème.