Restore the workflows

.github/workflows/build-appimage.yml

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+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

.github/workflows/build-ubuntu-aarch64.yml

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+name: CMake Build (Ubuntu aarch64)
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+env:
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    container: ubuntu:20.04
+
+    steps:
+    - name: Prepare system
+      shell: bash
+      run: |
+        apt update
+        apt -y full-upgrade
+        apt -y install git
+    - name: Check out source
+      uses: actions/checkout@v1
+    - name: Install dependencies
+      shell: bash
+      run: |
+        dpkg --add-architecture arm64
+        sh -c "sed \"s|^deb \([a-z\.:/]*\) \([a-z\-]*\) \(.*\)$|deb [arch=amd64] \1 \2 \3\ndeb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports \2 \3|\" /etc/apt/sources.list > /etc/apt/sources.list.new"
+        rm /etc/apt/sources.list
+        mv /etc/apt/sources.list{.new,}
+        apt update
+        DEBIAN_FRONTEND=noninteractive apt install -y {gcc-10,g++-10,pkg-config}-aarch64-linux-gnu {libsdl2,qtbase5,qtbase5-private,qtmultimedia5,libslirp,libarchive,libzstd}-dev:arm64 zstd:arm64 cmake extra-cmake-modules dpkg-dev
+    - name: Configure
+      shell: bash
+      run: |
+        CC=aarch64-linux-gnu-gcc-10 CXX=aarch64-linux-gnu-g++-10 cmake -DPKG_CONFIG_EXECUTABLE=/usr/bin/aarch64-linux-gnu-pkg-config $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -B build
+    - name: Make
+      shell: bash
+      run: |
+        cmake --build build -j$(nproc --all)
+        mkdir dist
+        cp build/melonDS dist
+    - uses: actions/upload-artifact@v1
+      with:
+        name: melonDS-ubuntu-aarch64
+        path: dist

.github/workflows/build-ubuntu.yml

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+name: CMake Build (Ubuntu 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 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)
+        mkdir dist
+        cp melonDS dist
+    - uses: actions/upload-artifact@v1
+      with:
+        name: melonDS-ubuntu-x86_64
+        path: ${{runner.workspace}}/build/dist

.github/workflows/build-windows.yml

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+name: CMake Build (Windows x86-64)
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+env:
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+
+    runs-on: windows-latest
+    
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+    - uses: actions/checkout@v1
+    - uses: msys2/setup-msys2@v2
+      with:
+          msystem: MINGW64
+          update: true
+
+    - name: Install dependencies
+      run: pacman -Sq --noconfirm git pkgconf mingw-w64-x86_64-{cmake,SDL2,qt5-static,libslirp,libarchive,toolchain}
+
+    - name: Configure
+      working-directory: ${{runner.workspace}}
+      run: cmake -B build $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DBUILD_STATIC=ON -DCMAKE_PREFIX_PATH=C:/tools/msys64/mingw64/qt5-static
+
+    - name: Make
+      working-directory: ${{runner.workspace}}/build
+      run: cmake --build .
+
+    - uses: actions/upload-artifact@v1
+      with:
+        name: melonDS-windows-x86_64
+        path: ${{runner.workspace}}\build\melonDS.exe