Add AppImage Builds (#1670)

* Create build-appimage.yml

* Update build-appimage.yml

This Adds the new Dependencies for MelonDS

.github/workflows/build-appimage.yml

@@ -0,0 +1,55 @@
+name: CMake Build (AppImage x86-64)
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+
+    runs-on: ubuntu-20.04
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install dependencies
+      run: |
+        sudo rm -f /etc/apt/sources.list.d/dotnetdev.list /etc/apt/sources.list.d/microsoft-prod.list
+        sudo apt update
+        sudo apt install cmake extra-cmake-modules libcurl4-gnutls-dev libpcap0.8-dev libsdl2-dev libqt5multimedia5-plugins qt5-default qtbase5-private-dev qtmultimedia5-dev libslirp0 libslirp-dev libarchive-dev zstd libzstd-dev --allow-downgrades
+    - name: Create build environment
+      run: mkdir ${{runner.workspace}}/build
+    - name: Configure
+      working-directory: ${{runner.workspace}}/build
+      run: cmake $GITHUB_WORKSPACE
+    - name: Make
+      working-directory: ${{runner.workspace}}/build
+      run: |
+        make -j$(nproc --all)
+    - name: Prepare AppDir for AppImage
+      working-directory: ${{runner.workspace}}/build
+      run: |
+        make install DESTDIR=AppDir
+        mv ./AppDir/usr/local/bin ./AppDir/usr/bin
+        mv ./AppDir/usr/local/share ./AppDir/usr/share
+        rm -rf ./AppDir/usr/local
+    - name: Prepare necessary Tools for building the AppImage
+      working-directory: ${{runner.workspace}}/build
+      run: |
+        wget https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
+        wget https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage
+        chmod a+x linuxdeploy-x86_64.AppImage
+        chmod a+x linuxdeploy-plugin-qt-x86_64.AppImage
+    - name: Build the AppImage
+      working-directory: ${{runner.workspace}}/build
+      run: |
+        ./linuxdeploy-x86_64.AppImage --appdir AppDir --plugin qt --output appimage
+        mkdir dist
+        cp ./melonDS*.AppImage ./dist
+    - uses: actions/upload-artifact@v1
+      with:
+        name: melonDS-appimage-x86_64
+        path: ${{runner.workspace}}/build/dist