- build.js: cargo build first, then docker build — no more Docker-in-Docker
- .dockerignore: exclude target/ but re-include
target/x86_64-unknown-linux-gnu/release/ so pre-built binaries
are available in Docker build context
- Strip builder stage from all Rust Dockerfiles; images now only contain
the runtime and a pre-built binary copied from target/.
- build.js: cargo builds all Rust binaries first (using all CPU cores),
then copies them into Docker images.
- .drone.yml: add cargo-build step before docker-build so kaniko can COPY
the pre-compiled binaries without rebuilding inside the image.
The kaniko --build-arg flag was missing from all docker-build commands,
causing TARGET to be empty and cargo build to produce binaries in the
wrong directory (target//release/ instead of target/x86_64-unknown-linux-gnu/release/).
