Add gitea CI workflow

.gitea/workflows/ci.yaml

@@ -0,0 +1,18 @@
+name: CI
+on:
+  - push
+jobs:
+  ci:
+    name: janitorial
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: https://github.com/actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          components: clippy
+      - run: |
+        cargo clippy --all-targets --all-features -- -D warnings
+        cargo fmt --check
+        cargo test --release