ci: Fix aya-bpf workflow

This was testing the aya crate with the nightly toolchain which wasn't
what was intented

Signed-off-by: Dave Tucker <dave@dtucker.co.uk>

.github/workflows/build-aya-bpf.yml

@@ -28,7 +28,7 @@ jobs:
       - uses: Swatinem/rust-cache@v1
 
       - name: Build
-        run: cargo build --verbose
+        run: cargo build --manifest-path bpf/Cargo.toml --verbose
 
       - name: Run tests
-        run: RUST_BACKTRACE=full cargo test --verbose
+        run: RUST_BACKTRACE=full cargo test --manifest-path bpf/Cargo.toml --verbose