Only verify simtest build, not test runs (temporarily broken due to a…

…nemo) (MystenLabs#4546)

* Support for `cargo simtest build` command

* Only verify simtest build, not test runs (temporarily broken due to anemo)

Co-authored-by: Mark Logan <mark@marklgn.com>

.github/workflows/rust.yml

@@ -93,7 +93,7 @@ jobs:
       - uses: taiki-e/install-action@nextest
       - name: cargo simtest
         run: |
-          scripts/simtest/cargo-simtest simtest
+          scripts/simtest/cargo-simtest simtest build
 
   # This is a no-op job that allows the resulting action names to line up when
   # there are no rust changes in a given PR/commit. This ensures that we can

scripts/simtest/cargo-simtest

@@ -43,8 +43,13 @@ else
   echo "Using MSIM_TEST_SEED=$MSIM_TEST_SEED from the environment"
 fi
 
-cargo nextest run \
-  --cargo-profile simulator \
+CARGO_COMMAND=(nextest run --cargo-profile simulator)
+if [ "$1" = "build" ]; then
+  shift
+  CARGO_COMMAND=(build --profile simulator)
+fi
+
+cargo ${CARGO_COMMAND[@]} \
   --config 'build.rustflags = ["--cfg", "msim"]' \
   --config 'patch.crates-io.tokio.git = "https://github.com/MystenLabs/mysten-sim.git"' \
   --config 'patch.crates-io.tokio.rev = "15dff80e8e69218bc20b08a5ef91a4f156e626ac"' \