one gate: check.sh, run locally and by the workflow

.forgejo/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: ci
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: install rust
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
+            | sh -s -- -y --default-toolchain stable --profile minimal \
+                --component rustfmt --component clippy
+          echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
+
+      - name: cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: cargo-${{ hashFiles('Cargo.lock') }}
+
+      - name: check
+        run: ./check.sh