Add github workflow for testing ubuntu cmake non-package-manager build

.github/workflows/build-cmake-test.yml

@@ -0,0 +1,101 @@
+---
+name: Build CMake Test
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04]
+        qt-version: [default]
+        build-system: [cmake]
+      fail-fast: false
+
+    steps:
+      - uses: actions/checkout@v2.3.4
+        with:
+          submodules: true
+
+      - name: Cache Qt
+        id: cache-qt
+        uses: actions/cache@v2.1.4
+        with:
+          path: ../Qt
+          key: ${{ runner.os }}-QtCache-${{ matrix.qt-version }}-20210109
+
+      # LINUX
+      - name: Install p7zip (Ubuntu)
+        if: startsWith(matrix.os, 'ubuntu')
+        run: sudo apt-get update && sudo apt-get -y install p7zip-full
+
+      - name: Install Qt (Default version)
+        uses: jurplel/install-qt-action@v2
+        if: ${{ matrix.qt-version == 'default' }}
+        with:
+          aqtversion: '==1.1.1'
+          cached: ${{ steps.cache-qt.outputs.cache-hit }}
+          extra: --external 7z
+
+      - name: Install Qt (Specific version)
+        uses: jurplel/install-qt-action@v2
+        if: ${{ matrix.qt-version != 'default' }}
+        with:
+          aqtversion: '==1.1.1'
+          cached: ${{ steps.cache-qt.outputs.cache-hit }}
+          extra: --external 7z
+          version: ${{ matrix.qt-version }}
+
+
+      # LINUX
+      - name: Install dependencies (Ubuntu)
+        if: startsWith(matrix.os, 'ubuntu')
+        run: |
+            sudo apt-get update
+            sudo apt-get -y install \
+                cmake \
+                virtualenv \
+                rapidjson-dev \
+                libssl-dev \
+                libboost-dev \
+                libxcb-randr0-dev \
+                libboost-system-dev \
+                libboost-filesystem-dev \
+                libpulse-dev \
+                libxkbcommon-x11-0 \
+                libgstreamer-plugins-base1.0-0 \
+                build-essential \
+                libgl1-mesa-dev \
+                libxcb-icccm4 \
+                libxcb-image0 \
+                libxcb-keysyms1 \
+                libxcb-render-util0 \
+                libxcb-xinerama0
+
+      - name: Build with CMake (Ubuntu)
+        if: startsWith(matrix.os, 'ubuntu') && matrix.build-system == 'cmake'
+        run: |
+            mkdir build
+            cd build
+            cmake -DCMAKE_INSTALL_PREFIX=appdir/usr/ -DCMAKE_BUILD_TYPE=Release ..
+            make -j8
+        shell: bash
+
+      - name: Package (Ubuntu)
+        if: startsWith(matrix.os, 'ubuntu')
+        run: |
+            cd build
+            sh ./../.CI/CreateAppImage.sh
+        shell: bash
+
+      - name: Upload artifact (Ubuntu)
+        if: startsWith(matrix.os, 'ubuntu')
+        uses: actions/upload-artifact@v2.2.2
+        with:
+          name: Chatterino-x86_64-${{ matrix.qt-version }}-${{ matrix.build-system }}.AppImage
+          path: build/Chatterino-x86_64.AppImage