ci: test upcoming Cranelift release branch

.github/workflows/cranelift-release-branch.yml

@@ -0,0 +1,63 @@
+name: Test upcoming Cranelift release branch
+
+on:
+  schedule:
+    - cron: "0 3 6 * *"
+  workflow_dispatch: {}
+
+permissions: {}
+
+env:
+  CARGO_BUILD_INCREMENTAL: false
+  RUSTFLAGS: "-Dwarnings"
+
+jobs:
+  test_upcoming_cranelift_release:
+    runs-on: ubuntu-latest
+    timeout-minutes: 90
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Determine latest Wasmtime release branch
+        id: wasmtime_release_branch
+        run: |
+          branches="$(
+            git ls-remote --heads https://github.com/bytecodealliance/wasmtime.git "refs/heads/release-*" \
+              | awk '{print $2}' \
+              | sed 's#refs/heads/##' \
+              | sort -V
+          )"
+          if [[ -z "${branches}" ]]; then
+            echo "No wasmtime release branches found"
+            exit 1
+          fi
+          latest="$(echo "${branches}" | tail -n 1)"
+          echo "Latest release branch: ${latest}"
+          echo "branch=${latest}" >> "$GITHUB_OUTPUT"
+
+      - name: Patch Cargo.toml to use release branch Cranelift
+        run: |
+          cat >>Cargo.toml <<EOF
+          [patch.crates-io]
+          cranelift-codegen = { git = "https://github.com/bytecodealliance/wasmtime.git", branch = "$(echo $WASMTIME_RELEASE_BRANCH)" }
+          cranelift-frontend = { git = "https://github.com/bytecodealliance/wasmtime.git", branch = "$(echo $WASMTIME_RELEASE_BRANCH)" }
+          cranelift-module = { git = "https://github.com/bytecodealliance/wasmtime.git", branch = "$(echo $WASMTIME_RELEASE_BRANCH)" }
+          cranelift-native = { git = "https://github.com/bytecodealliance/wasmtime.git", branch = "$(echo $WASMTIME_RELEASE_BRANCH)" }
+          cranelift-jit = { git = "https://github.com/bytecodealliance/wasmtime.git", branch = "$(echo $WASMTIME_RELEASE_BRANCH)" }
+          cranelift-object = { git = "https://github.com/bytecodealliance/wasmtime.git", branch = "$(echo $WASMTIME_RELEASE_BRANCH)" }
+          EOF
+        env:
+          WASMTIME_RELEASE_BRANCH: ${{ steps.wasmtime_release_branch.outputs.branch }}
+
+      - name: Prepare dependencies
+        run: ./y.sh prepare
+
+      - name: Build (sysroot none)
+        run: ./y.sh build --sysroot none
+
+      - name: Test
+        env:
+          TARGET_TRIPLE: x86_64-unknown-linux-gnu
+        run: ./y.sh test
+