github: Expand workflow

Add fmt, clippy, test, and codecov targets

Signed-off-by: Nathaniel Clark <Nathaniel.Clark@misrule.us>

.github/workflows/ci.yml

@@ -0,0 +1,93 @@
+name: RPN Push
+
+on:
+  push:
+    branches:
+      - main
+      - master
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - run: sudo apt-get install -y libjpeg-dev libpng-dev libpango1.0-dev libxft-dev
+      - uses: actions/checkout@v4
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --locked
+
+  test:
+    name: Test Suite
+    runs-on: ubuntu-latest
+    steps:
+      - run: sudo apt-get install -y libjpeg-dev libpng-dev libpango1.0-dev libxft-dev
+      - uses: actions/checkout@v4
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      - run: rustup component add rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - run: sudo apt-get install -y libjpeg-dev libpng-dev libpango1.0-dev libxft-dev
+      - uses: actions/checkout@v4
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --locked -- -D warnings
+
+  coverage:
+    name: coverage
+    runs-on: ubuntu-latest
+    steps:
+      - run: sudo apt-get install -y libjpeg-dev libpng-dev libpango1.0-dev libxft-dev
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install `cargo-llvm-cov`
+        uses: taiki-e/install-action@cargo-llvm-cov
+
+      - name: Measure code coverage for all tests
+        run: |
+          # Fail if any tests fail
+          set -e
+          set -o pipefail
+          cargo llvm-cov --all-features --codecov --output-path codecov.json
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: codecov.json
+          fail_ci_if_error: true