Packaging: containerised CI, Flatpak/AppImage, bundled simd, licence notices, and release-please (#53)

.github/workflows/pr-build.yaml

@@ -0,0 +1,27 @@
+name: PR Build & Test
+
+on:
+  pull_request:
+  push:
+    branches: [ "master" ]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Checkout submodules
+        run: git submodule update --init --recursive
+      - name: Update apt
+        run: sudo apt update
+      - name: Install dependencies
+        # Same list as ci.yaml's ubuntu-latest leg, minus the GUI-only deps
+        # (libgtk-3-dev, libglu1-mesa-dev) and libcurl4-openssl-dev — this
+        # workflow builds the CLI + test suite only, not the GUI.
+        run: sudo apt install -y libuv1-dev libargtable2-dev libserialport-dev libconfig-dev libhidapi-dev liblua5.4-dev libxdg-basedir-dev libxml2-dev libpulse-dev libproc2-dev
+      - name: Configure CMake
+        run: cmake -B build -DENABLE_TESTS=ON -DCMAKE_BUILD_TYPE=Debug
+      - name: Build
+        run: cmake --build build --config Debug
+      - name: Run tests
+        run: ctest --test-dir build --output-on-failure