Add CI workflow for automated build and testing

Author: ramon.valles

.github/workflows/ci.yml

@@ -0,0 +1,90 @@
+name: CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  build-test:
+    name: Build + Test
+    runs-on: ubuntu-22.04
+    env:
+      CARGO_TERM_COLOR: always
+      CMAKE_BUILD_PARALLEL_LEVEL: 2
+    steps:
+      - name: Checkout (with submodules)
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+          fetch-depth: 0
+
+      - name: Show selected dependency revisions
+        shell: bash
+        run: |
+          set -euo pipefail
+          git submodule status --recursive
+          echo
+          echo "tempoch:     $(git -C tempoch rev-parse HEAD) ($(git -C tempoch describe --tags --always 2>/dev/null || true))"
+          echo "tempoch-ffi: $(git -C tempoch/tempoch-ffi rev-parse HEAD) ($(git -C tempoch/tempoch-ffi describe --tags --always 2>/dev/null || true))"
+
+      - name: Install system dependencies
+        shell: bash
+        run: |
+          set -euo pipefail
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            build-essential \
+            cmake \
+            ninja-build \
+            pkg-config
+
+      - name: Set up Rust (stable)
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
+
+      - name: Cache cargo + build artifacts
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            tempoch/target
+            tempoch/tempoch-ffi/target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Validate required submodules exist
+        shell: bash
+        run: |
+          set -euo pipefail
+          test -f tempoch/Cargo.toml
+          test -f tempoch/tempoch-ffi/Cargo.toml
+
+      - name: Configure (CMake)
+        shell: bash
+        run: |
+          set -euo pipefail
+          cmake -S . -B build -G Ninja
+
+      - name: Build
+        shell: bash
+        run: |
+          set -euo pipefail
+          cmake --build build --target test_tempoch
+
+      - name: Test (ctest)
+        shell: bash
+        run: |
+          set -euo pipefail
+          ctest --test-dir build --output-on-failure