feat: add Python-alpine Dockerfile for enhanced build process and testing with id-configurator

Signed-off-by: d9pouces <github@19pouces.net>

tests/dockerfiles/Rust.Dockerfile

@@ -0,0 +1,16 @@
+FROM rust:1-slim AS target
+FROM interdiode/id-configurator:latest AS configuration
+COPY --from=target / /src/
+COPY --from=generated-config Rust.yaml /config.yaml
+RUN id-configurator apply --config /config.yaml --src /src --dst /dst
+FROM target AS runtime
+COPY --from=configuration /dst/ /
+# Deliberately not touching CARGO_HOME (the official image sets it to
+# /usr/local/cargo): id-configurator writes /.cargo/config.toml, which
+# cargo's config search always consults regardless of CARGO_HOME, precisely
+# so this doesn't need to line up with wherever CARGO_HOME happens to point.
+RUN cargo new /tmp/rusttest -q && cd /tmp/rusttest \
+    && cargo add idconfiguratortestpkg \
+    && cargo fetch \
+    && grep -qx '// test-only crate served by the id-configurator integration tests' \
+       "$(find "$CARGO_HOME/registry/src" -name lib.rs)"