ci: add GitLab CI/CD pipeline and Docker build images

.actrc

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+# Linux runners (catthehacker = optimized images for act)
+-P ubuntu-latest=catthehacker/ubuntu:act-latest
+-P ubuntu-22.04=catthehacker/ubuntu:act-latest
+-P ubuntu-24.04=catthehacker/ubuntu:act-latest
+
+# ARM64: same runner image, act uses --container-architecture linux/arm64 + QEMU
+-P ubuntu-22.04-arm=catthehacker/ubuntu:act-latest
+
+# Windows: act cannot run Windows containers on Linux,
+# so a Linux image is used to validate the workflow logic
+-P windows-latest=catthehacker/ubuntu:act-latest
+
+# macOS: act cannot run macOS containers on Linux,
+# so a Linux image is used to validate the workflow logic
+-P macos-13=catthehacker/ubuntu:act-latest
+-P macos-14=catthehacker/ubuntu:act-latest
+
+# Windows ARM64: same approach as Windows x64 and macOS
+-P windows-11-arm=catthehacker/ubuntu:act-latest

.github/workflows/macos.yml

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+name: macos
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [main]
+    tags: ['[0-9]+.[0-9]+.[0-9]+']
+  pull_request:
+    types: [opened, synchronize]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  macos-build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: macos-13
+            arch: x86_64
+          - os: macos-14
+            arch: arm64
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup pixi
+        uses: prefix-dev/setup-pixi@v0.8.1
+        with:
+          pixi-version: latest
+          cache: true
+          # locked: false because pixi.lock does not yet include osx platforms;
+          # the lock file will be updated once macOS is added to the CI baseline
+          locked: false
+          cache-write: ${{ github.event_name != 'pull_request' }}
+
+      - name: Cache conan packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.conan2/p
+          key: conan-macos-${{ matrix.arch }}-${{ hashFiles('conanfile.py') }}
+          restore-keys: conan-macos-${{ matrix.arch }}-
+
+      - name: Cache ccache
+        uses: actions/cache@v4
+        with:
+          path: ~/.ccache
+          key: ccache-macos-${{ matrix.arch }}-${{ github.sha }}
+          restore-keys: ccache-macos-${{ matrix.arch }}-
+
+      - name: Build & Test
+        run: pixi run all
+
+      - name: Package artifacts
+        if: startsWith(github.ref, 'refs/tags/')
+        run: |
+          mkdir -p dist
+          for ext_dir in extensions/*/; do
+            name=$(basename "$ext_dir")
+            mkdir -p "dist/$name"
+            find build/Release -name "${name}.dylib" -exec cp {} "dist/$name/" \; 2>/dev/null || true
+            cp "${ext_dir}manifest.json" "dist/$name/" 2>/dev/null || true
+          done
+          ls -la dist/*/
+          cd dist && zip -r ../pj-test-dummy-plugins-${{ github.ref_name }}-macos-${{ matrix.arch }}.zip .
+
+      - name: Upload artifact
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: actions/upload-artifact@v4
+        with:
+          name: pj-test-dummy-plugins-${{ github.ref_name }}-macos-${{ matrix.arch }}
+          path: pj-test-dummy-plugins-${{ github.ref_name }}-macos-${{ matrix.arch }}.zip
+
+      - name: Upload to Release
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v2
+        with:
+          files: pj-test-dummy-plugins-${{ github.ref_name }}-macos-${{ matrix.arch }}.zip
+          generate_release_notes: false
+          fail_on_unmatched_files: false
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/ubuntu.yml

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+name: ubuntu
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [main]
+    tags: ['[0-9]+.[0-9]+.[0-9]+']
+  pull_request:
+    types: [opened, synchronize]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  ubuntu-build:
+    runs-on: ${{ matrix.ubuntu-runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - ubuntu-runner: ubuntu-22.04
+            arch: x86_64
+          - ubuntu-runner: ubuntu-22.04-arm
+            arch: aarch64
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup pixi
+        uses: prefix-dev/setup-pixi@v0.8.1
+        with:
+          pixi-version: latest
+          cache: true
+          locked: false
+          cache-write: ${{ github.event_name != 'pull_request' }}
+
+      - name: Cache conan packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.conan2/p
+          key: conan-ubuntu-${{ matrix.arch }}-${{ hashFiles('conanfile.py') }}
+          restore-keys: conan-ubuntu-${{ matrix.arch }}-
+
+      - name: Cache ccache
+        uses: actions/cache@v4
+        with:
+          path: ~/.ccache
+          key: ccache-ubuntu-${{ matrix.arch }}-${{ github.sha }}
+          restore-keys: ccache-ubuntu-${{ matrix.arch }}-
+
+      - name: Build & Test
+        run: pixi run all
+
+      - name: Package artifacts
+        if: startsWith(github.ref, 'refs/tags/')
+        run: |
+          mkdir -p dist
+          for ext_dir in extensions/*/; do
+            name=$(basename "$ext_dir")
+            mkdir -p "dist/$name"
+            find build/Release -name "${name}.so" -exec cp {} "dist/$name/" \; 2>/dev/null || true
+            cp "${ext_dir}manifest.json" "dist/$name/" 2>/dev/null || true
+          done
+          ls -la dist/*/
+          cd dist && zip -r ../pj-test-dummy-plugins-${{ github.ref_name }}-linux-${{ matrix.arch }}.zip .
+
+      - name: Upload artifact
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: actions/upload-artifact@v4
+        with:
+          name: pj-test-dummy-plugins-${{ github.ref_name }}-linux-${{ matrix.arch }}
+          path: pj-test-dummy-plugins-${{ github.ref_name }}-linux-${{ matrix.arch }}.zip
+
+      - name: Upload to Release
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v2
+        with:
+          files: pj-test-dummy-plugins-${{ github.ref_name }}-linux-${{ matrix.arch }}.zip
+          generate_release_notes: true
+          fail_on_unmatched_files: false
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}