DEBUG: turn off fail-fast for wasmtime build matrix, and test wasi-cap-std-sync first

the wasi-cap-std-sync test is designed to isolate some weird CI behavior
with EPERM on a preopen

.github/workflows/main.yml

@@ -387,6 +387,7 @@ jobs:
     name: Build wasmtime
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         include:
         - build: x86_64-linux
@@ -461,6 +462,10 @@ jobs:
 
     # Build `libwasmtime.so`
     - run: $CENTOS cargo build --release --manifest-path crates/c-api/Cargo.toml
+    - run: |
+        $CENTOS cargo test \
+            --release \
+            -p wasi-cap-std-sync
 
     # Test what we just built.
     #