turn on musl test in CI

.github/workflows/main.yml

@@ -68,7 +68,34 @@ jobs:
           export LD_LIBRARY_PATH=$HOME/.wasmedge/lib
           cd ./crates && cargo test --all --all-features --no-fail-fast
       - name: Run feature tests
-        run: just featuretest
+        run: just test-features
+
+  # musl target testing is religated to a separate job because our current build
+  # for musl requires nightly. It is difficult to mix stable and nightly
+  # toolchains in the same job.
+  musl:
+    needs: [changes]
+    if: needs.changes.outputs.any_modified == 'true'
+    runs-on: ubuntu-22.04
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v3
+      # We do not use `actions-rust-lang/setup-rust-toolchain` here because we
+      # want to override the default toolchain file to use nightly toolchains.
+      # The `setup-rust-toolchain` action will always choose toolchain file with
+      # no way to override. 
+      - name: Setup Rust toolchain and cache
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: nightly
+          target: x86_64-unknown-linux-musl
+          components: rust-src
+      - uses: taiki-e/install-action@just
+      - name: Install requirements
+        run: sudo env PATH=$PATH just ci-musl-prepare
+      - name: Run test against musl target
+        run: just test-musl
+
 
   coverage:
     needs: [changes]

justfile

@@ -32,17 +32,21 @@ rust-oci-tests-bin:
 test-oci: oci-tests rust-oci-tests
 
 # run all tests except rust-oci 
-test-all: unittest featuretest oci-tests containerd-test # currently not doing rust-oci here
+test-all: unittest test-features oci-tests containerd-test # currently not doing rust-oci here
 
 # run cargo unittests
 unittest:
     cd ./crates
     LD_LIBRARY_PATH=${HOME}/.wasmedge/lib cargo test --all --all-targets --all-features
 
 # run permutated feature compilation tests
-featuretest:
+test-features:
     {{ cwd }}/scripts/features_test.sh
 
+# run test against musl target
+test-musl:
+    {{ cwd }}/scripts/musl_test.sh
+
 # run oci integration tests
 oci-tests: 
     {{ cwd }}/scripts/oci_integration_tests.sh {{ cwd }}
@@ -143,3 +147,23 @@ ci-prepare:
 
     echo "Unknown system. The CI is only configured for Ubuntu. You will need to forge your own path. Good luck!"
     exit 1
+
+ci-musl-prepare: ci-prepare
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    # Check if system is Ubuntu
+    if [[ -f /etc/lsb-release ]]; then
+        source /etc/lsb-release
+        if [[ $DISTRIB_ID == "Ubuntu" ]]; then
+            echo "System is Ubuntu"
+            apt-get -y update
+            apt-get install -y \
+                musl-dev \
+                musl-tools
+            exit 0
+        fi
+    fi
+
+    echo "Unknown system. The CI is only configured for Ubuntu. You will need to forge your own path. Good luck!"
+    exit 1