fix(CI): install riscv64imac-unknown-none-elf in build/libalt_bn128.a

error[E0463]: can't find crate for `core`
  |
  = note: the `riscv64imac-unknown-none-elf` target may not be installed
  = help: consider downloading the target with `rustup target add riscv64imac-unknown-none-elf`
  = help: consider building the standard library from source with `cargo build -Zbuild-std`

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
         key: ${{ runner.os }}-cargo-${{ hashFiles('Cargo.lock') }}
 
     - name: Install Rust components
-      run: rustup component add rustfmt && rustup component add clippy && rustup target add riscv64imac-unknown-none-elf
+      run: rustup component add rustfmt && rustup component add clippy
     - name: Install moleculec
       run: |
         test "$(moleculec --version)" = "Moleculec 0.6.1" \

Makefile

@@ -171,6 +171,7 @@ build/bignum.o: deps/mbedtls/library/bignum.c
 
 # Pairing cryptography library in Rust
 build/libalt_bn128.a:
+	cd deps/bn/alt_bn128_staticlib && rustup target add riscv64imac-unknown-none-elf
 	cd deps/bn/alt_bn128_staticlib && cargo build --release --target riscv64imac-unknown-none-elf
 	cp deps/bn/alt_bn128_staticlib/target/riscv64imac-unknown-none-elf/release/libalt_bn128.a build/