Add build infra

.gitea/workflows/builder.yaml

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+name: '🐳 Build Builder Image'
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'Dockerfile.builder'
+  workflow_dispatch:
+
+jobs:
+  build-and-push:
+    runs-on: linux/amd64
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to Gitea registry
+        run: echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login gitea.tourolle.paris -u "${{ secrets.REGISTRY_USER }}" --password-stdin
+
+      - name: Build image
+        run: docker build -f Dockerfile.builder -t gitea.tourolle.paris/dtourolle/kpnpp-builder:latest .
+
+      - name: Push image
+        run: docker push gitea.tourolle.paris/dtourolle/kpnpp-builder:latest

.gitea/workflows/test.yaml

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+name: '🧪 Test'
+
+on:
+  push:
+    branches:
+      - master
+      - develop
+    paths-ignore:
+      - '**/*.md'
+  pull_request:
+    branches:
+      - master
+      - develop
+    paths-ignore:
+      - '**/*.md'
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: linux/amd64
+    container:
+      image: gitea.tourolle.paris/dtourolle/kpnpp-builder:latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          path: test-${{ github.run_id }}
+
+      - name: Cache FetchContent dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.cmake/fetchcontent
+          key: cmake-fetchcontent-${{ hashFiles('**/CMakeLists.txt') }}
+          restore-keys: cmake-fetchcontent-
+
+      - name: Configure
+        working-directory: test-${{ github.run_id }}
+        run: |
+          cmake -S . -B build \
+            -G Ninja \
+            -DCMAKE_BUILD_TYPE=Debug \
+            -DKPN_BUILD_TESTS=ON \
+            -DKPN_BUILD_EXAMPLES=OFF \
+            -DKPN_BUILD_PYTHON=ON \
+            -DFETCHCONTENT_BASE_DIR=$HOME/.cmake/fetchcontent
+
+      - name: Build
+        working-directory: test-${{ github.run_id }}
+        run: cmake --build build --parallel
+
+      - name: Run tests
+        working-directory: test-${{ github.run_id }}
+        run: |
+          cd build
+          ctest --output-on-failure --output-junit test-results.xml
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v3
+        with:
+          name: test-results
+          path: test-${{ github.run_id }}/build/test-results.xml
+          retention-days: 7
+
+      - name: Cleanup
+        if: always()
+        run: rm -rf test-${{ github.run_id }}

Dockerfile.builder

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+# KPN++ Builder Image
+# Pre-built image with GCC, CMake, Ninja, and Python dev headers for building and testing KPN++
+# Build: docker build -f Dockerfile.builder -t gitea.tourolle.paris/dtourolle/kpnpp-builder:latest .
+# Push:  docker push gitea.tourolle.paris/dtourolle/kpnpp-builder:latest
+
+FROM gcc:14
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    cmake \
+    ninja-build \
+    python3 \
+    python3-dev \
+    python3-pip \
+    git \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /src