ci: add i686 test

Signed-off-by: Jun Kimura <jun.kimura@datachain.jp>

Author: bluele

.github/workflows/test.yml

@@ -33,3 +33,13 @@ jobs:
         run: rzup install rust && rzup install cargo-risczero 1.2.2
       - run: . "/home/runner/.bashrc" && ZKDCAP_RISC0_BUILD=1 cargo build -r --manifest-path=./zkvm/risc0/Cargo.toml
       - run: git diff --exit-code
+
+  test-i686:
+    runs-on: ubuntu-24.04
+    container:
+      image: i386/rust:1.84
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo test