add lint workflow

.forgejo/workflows/lint.yml

@@ -0,0 +1,14 @@
+on: [push]
+
+jobs:
+  lint:
+    runs-on: docker
+    container:
+      image: rust:1.74
+    steps:
+      # no nodejs installed in rust by default
+      - run: apt update && apt install -y nodejs
+      - uses: https://code.forgejo.org/actions/checkout@v3
+      - run: rustup component add rustfmt clippy
+      - run: cargo fmt --all --check --verbose
+      - run: cargo clippy --all --check --verbose