Add Forgejo CI (build, test, fmt, clippy)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.forgejo/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: ci
+on:
+  push:
+  pull_request:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: system deps
+        run: apt-get update && apt-get install -y --no-install-recommends pkg-config libssl-dev curl ca-certificates build-essential
+      - name: install rust
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal -c clippy -c rustfmt
+          echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
+      - name: test
+        run: cargo test --verbose
+      - name: format
+        continue-on-error: true
+        run: cargo fmt --check
+      - name: clippy
+        continue-on-error: true
+        run: cargo clippy --all-targets -- -D warnings