ci: artifacts: adjust musl build triplet name

Use the same build triplet name that Rust uses: `x86_64-unknown-linux-musl`

CI-Tags: #no_auto_pr

Author: Jason Mobarak

scripts/ci_build_rust.bash

@@ -10,7 +10,7 @@ if [ "$RUNNER_OS" == "macOS" ]; then
     EXECUTABLES=("sbp2json" "json2sbp" "json2json")
     PACKAGE_CMD="zip ../../$ARTIFACT_NAME ${EXECUTABLES[*]}"
 elif [ "$RUNNER_OS" == "Linux" ]; then
-    BUILD_TRIPLET="x86_64-linux-musl"
+    BUILD_TRIPLET="x86_64-unknown-linux-musl"
     ARTIFACT_NAME="sbp_tools-${VERSION}-${BUILD_TRIPLET}.zip"
     EXECUTABLES=("sbp2json" "json2sbp" "json2json")
     PACKAGE_CMD="zip ../../../$ARTIFACT_NAME ${EXECUTABLES[*]}"