add CI for Cygwin

Author: oech3

.github/workflows/low-priority-targets.yml

@@ -0,0 +1,54 @@
+# spell-checker:ignore wasip
+name: low-priotiry-targets
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+# End the current execution if there is a new changeset in the PR.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
+jobs:
+  wasi:
+    name: check wasi
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v6
+    - uses: dtolnay/rust-toolchain@nightly
+      with:
+        targets: wasm32-wasip1
+    - name: check
+      run: cargo check --target wasm32-wasip1
+
+  windows:
+    name: check windows
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v6
+    - uses: dtolnay/rust-toolchain@nightly
+      with:
+        targets: wasm32-wasip1
+    - name: check
+      run: cargo check
+
+  cygwin:
+    name: check cygwin
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v6
+    - name: setup toolchain
+      shell: 'C:\msys64\usr\bin\bash.exe --login -eo pipefail {0}'
+      run:  pacman -Sy --noconfirm --needed rust
+    - name: check
+      shell: 'C:\msys64\usr\bin\bash.exe --login -eo pipefail {0}'
+      env:
+        CHERE_INVOKING: 1
+        RUSTC_BOOTSTRAP: 1
+      run: cargo check --target x86_64-pc-cygwin