chore: Add a more capable CI workflow

This is mostly copied from the Granddave/timecalc-rs project without the
docs building which is not needed for this project.

.github/workflows/ci.yml

@@ -1,40 +1,92 @@
 ---
-name: ci
+name: Continious integration
 
 on:
-  push:
   pull_request:
+    paths-ignore:
+      - "**/*.md"
+  push:
+    branches:
+      - "master"
+      - "renovate/**"
+    paths-ignore:
+      - "**/*.md"
+  merge_group:
+    types:
+      - checks_requested
 
 env:
   CARGO_TERM_COLOR: always
+  RUSTFLAGS: -D warnings
+  RUSTDOCFLAGS: -D warnings
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 
 jobs:
-  build:
-    strategy:
-      matrix:
-        toolchain:
-          - stable
-          - beta
+  fmt:
+    name: Rustfmt
     runs-on: ubuntu-latest
-
     steps:
-      - uses: actions/checkout@v3
-
-      - name: Install Rust
-        uses: actions-rs/toolchain@v1
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
         with:
-          profile: minimal
-          toolchain: ${{ matrix.toolchain }}
-          components: rustfmt, clippy
-
-      - name: Format
+          toolchain: stable
+          components: rustfmt
+      - name: Run Cargo Fmt
         run: cargo fmt --all -- --check
 
-      - name: Build
-        run: cargo build --verbose
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: stable
+          components: clippy
+      - name: Get build cache
+        uses: Swatinem/rust-cache@v2
+      - name: Run clippy
+        run: cargo clippy --all-targets -- -D warnings
 
-      - name: Run tests
-        run: cargo test
+  test:
+    name: Test
+    runs-on: ${{ matrix.job.os }}
+    strategy:
+      matrix:
+        job:
+          - os: macos-latest
+          - os: ubuntu-latest
+          - os: windows-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: stable
+      - name: Get build cache
+        uses: Swatinem/rust-cache@v2
+      - name: Run Cargo Test
+        run: cargo test -r --all-targets --workspace
 
-      - name: Run clippy
-        run: cargo clippy -- -D warnings
+  result:
+    name: Result (CI)
+    runs-on: ubuntu-latest
+    needs:
+      - fmt
+      - clippy
+      - test
+    steps:
+      - name: Mark the job as successful
+        run: exit 0
+        if: "success()"
+      - name: Mark the job as unsuccessful
+        run: exit 1
+        if: "!success()"