add riscv64 release target

Author: QaidVoid

.github/workflows/nightly.yaml

@@ -36,6 +36,10 @@ jobs:
               NAME: aarch64-linux,
               TARGET: aarch64-unknown-linux-musl,
             }
+          - {
+              NAME: riscv64-linux,
+              TARGET: riscv64gc-unknown-linux-musl
+            }
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -64,7 +68,7 @@ jobs:
           target: ${{ matrix.build.TARGET }}
 
       - name: Build
-        run: cargo build --release --locked --target ${{ matrix.build.TARGET }}
+        run: RUSTFLAGS="-C target-feature=+crt-static" cargo build --release --locked --target ${{ matrix.build.TARGET }}
 
       - name: Prepare nightly binary
         shell: bash