Add a custom no-op cargo test runner

Author: LegNeato

.ci/cargo_glue.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -e
+
+# This script is used by cargo to run the test runner with the 
+# specified arguments.
+#
+# We need this script because the cwd that cargo runs the runner in changes
+# depending on crate.
+
+cd "$GITHUB_WORKSPACE/.ci/;
+echo "In glue script with cwd: $(pwd)"

.ci/config.toml

@@ -0,0 +1,8 @@
+[target.x86_64-unknown-linux-gnu]
+# The command to execute instead of the compiled test binary. Cargo will append the
+# actual path to the compiled test executable and any arguments (like --list, --exact,
+# --nocapture) after this command. 
+# We use a tool without a slash in it so cargo will search $PATH.
+#
+# Before calling the `cargo test` we append the location of the glue to the path.
+runner = ["cargo_glue.sh"]

.github/workflows/ci_linux.yml

@@ -152,4 +152,5 @@ jobs:
           MODAL_TOKEN_ID: ${{ secrets.MODAL_TOKEN_ID }}
           MODAL_TOKEN_SECRET: ${{ secrets.MODAL_TOKEN_SECRET }}
         run: |
-          echo "Stubbed out"
+          export PATH="$PATH:$GITHUB_WORKSPACE/.ci"
+          cargo --config .ci/config.toml test --workspace --exclude "optix" --exclude "path_tracer" --exclude "denoiser" --exclude "add" --exclude "ex*"