fix(ci): install x86_64-musl

Signed-off-by: Lachezar Lechev <lachezar@lechev.space>

Author: elpiel

.github/workflows/rust.yml

@@ -43,11 +43,11 @@ jobs:
     steps:
       - name: Checkout Sources
         uses: actions/checkout@v4
-      - name: Install Rust (thumbv7em)
+      - name: Install Rust (thumbv7em, x86_64-musl targets)
         uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
-          target: thumbv7em-none-eabihf
+          target: thumbv7em-none-eabihf, x86_64-unknown-linux-musl
       - name: Build - default features
         run: cargo build
       - name: Build - std
@@ -67,6 +67,8 @@ jobs:
           tool: cargo-fuzz
       - name: Fuzz (nightly only)
         if: ${{ matrix.rust == 'nightly' }}
+        env:
+          RUSTFLAGS: "-C target-feature=-crt-static"
         run: |
           cargo +nightly fuzz run init -- -max_total_time=900
           cargo +nightly fuzz run calibrate -- -max_total_time=1800