[bfops/debug-link-error]: fix

Author: bfops

.github/workflows/ci.yml

@@ -686,11 +686,18 @@ jobs:
           save-if: false
           prefix-key: v1
 
-      - name: Look for v8 outputs
+      # This step shouldn't be needed, but somehow we end up with caches that are missing librusty_v8.a.
+      # ChatGPT suspects that this could be due to different build invocations using the same target dir,
+      # and this makes sense to me because we only see it in this job where we mix `cargo build -p` with
+      # `cargo build --manifest-path` (which apparently build different dependency trees).
+      # However, we've been unable to fix it so... /shrug
+      - name: Check v8 outputs
         run: |
-          set -x
-          readlink -f "${CARGO_TARGET_DIR}"/ || true
           find "${CARGO_TARGET_DIR}"/ -type f | grep '[/_]v8' || true
+          if ! [ -f "${CARGO_TARGET_DIR}"/debug/gn_out/obj/librusty_v8.a ]; then
+            echo "Could not find v8 output file librusty_v8.a; rebuilding manually."
+            cargo build v8
+          fi
 
       - name: Check quickstart-chat bindings are up to date
         working-directory: sdks/csharp