Add coverage for rust

Author: alien11689

.github/workflows/build-rust.yml

@@ -55,3 +55,35 @@ jobs:
           cargo run ${{matrix.type}} >> out
           echo '```' >> out
           cat out >> "$GITHUB_STEP_SUMMARY"
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Get private repo
+        uses: actions/checkout@v4
+        with:
+          repository: alien11689/advent-of-code
+          ref: master
+          token: ${{ secrets.ADVENT_OF_CODE_PAT}}
+          path: private
+      - name: Get files
+        run: |
+          mkdir -p rust-aoc/resources/2015 rust-aoc/resources/2023 rust-aoc/resources/2024
+          cp -r private/2015/src/main/resources/* rust-aoc/resources/2015
+          cp -r private/2023/src/main/resources/* rust-aoc/resources/2023
+          cp -r private/2024/src/main/resources/* rust-aoc/resources/2024
+      - name: Rust update
+        run: rustup update
+      - name: Install coverage tool
+        run: cargo install cargo-tarpaulin
+      - name: Gather coverage
+        run: |
+          cd rust-aoc
+          cargo tarpaulin -o Lcov
+      - name: Upload coverage
+        uses: codecov/codecov-action@v3
+        with:
+          fail_ci_if_error: true
+          files: rust-aoc/lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}