diff --git a/.github/workflows/macosx_cpn_nightly.yml b/.github/workflows/macosx_cpn_nightly.yml
new file mode 100644
index 000000000..66b68ee6c
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+++ b/.github/workflows/macosx_cpn_nightly.yml
@@ -0,0 +1,112 @@
+name: MacOSX nightly Companion
+
+on:
+  schedule:
+    - cron:  '20 23 * * *'
+
+  workflow_dispatch:
+
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    # The CMake configure and build commands are platform agnostic and should work equally
+    # well on Windows or Mac.  You can convert this to a matrix build if you need
+    # cross-platform coverage.
+    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
+    runs-on: macos-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Create Build Environment
+        # Some projects don't allow in-source building, so create a separate build directory
+        # We'll use this as our working directory for all subsequent commands
+        run: cmake -E make_directory ${{github.workspace}}/build
+
+      - name: Install Qt
+        uses: jurplel/install-qt-action@v2
+        with:
+          version: '5.12.9'
+
+      - name: Install dependencies
+        run: python -m pip install --upgrade pip Pillow
+
+      - name: Install ARM toolchain
+        uses: fiam/arm-none-eabi-gcc@v1
+        with:
+          release: '6-2017-q2'
+
+      - name: Install dfu-util
+        run:   wget https://downloads.sourceforge.net/project/dfu-util/dfu-util-0.9.tar.gz &&
+          tar xfv dfu-util-0.9.tar.gz &&
+          cd dfu-util-0.9 &&
+          ./configure &&
+          make install
+
+      - name: Install libusb
+        run:   wget https://github.com/libusb/libusb/releases/download/v1.0.20/libusb-1.0.20.tar.bz2 &&
+          export MACOSX_DEPLOYMENT_TARGET=10.9 &&
+          tar xfv libusb-1.0.20.tar.bz2 &&
+          cd libusb-1.0.20 &&
+          ./configure &&
+          make install &&
+          cd ..
+
+      - name: Install libsdl
+        run:   wget https://www.libsdl.org/release/SDL-1.2.15.tar.gz &&
+          tar xfv SDL-1.2.15.tar.gz &&
+          export MACOSX_DEPLOYMENT_TARGET=10.9 &&
+          cd SDL-1.2.15 &&
+          wget 'https://bugzilla-attachments.libsdl.org/attachment.cgi?id=1320' -O patch1 &&
+          wget 'https://bugzilla-attachments.libsdl.org/attachment.cgi?id=1324' -O patch2 &&
+          wget 'https://hg.libsdl.org/SDL/raw-rev/91ad7b43317a' -O patch3 &&
+          patch -p1 < patch1 &&
+          patch -p1 < patch2 &&
+          patch -p1 < patch3 &&
+          ./configure --without-x &&
+          make install
+
+      - name: install lftp
+        working-directory: ${{github.workspace}}
+        shell: bash
+        run:  brew install lftp
+
+      - name: Configure CMake
+        # Use a bash shell so we can use the same syntax for environment variable
+        # access regardless of the host operating system
+        shell: bash
+        working-directory: ${{github.workspace}}/build
+        # Note the current convention is to use the -S and -B options here to specify source
+        # and build directories, but this is only available with CMake 3.13 and higher.
+        # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
+        run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DCMAKE_OSX_DEPLOYMENT_TARGET='10.9'
+
+      - name: Build
+        working-directory: ${{github.workspace}}
+        shell: bash
+        # Execute the build.  You can specify a specific target with "--target <NAME>"
+        run: mkdir ${{github.workspace}}/output && tools/build-companion-nightly.sh ${{github.workspace}}  ${{github.workspace}}/output/
+
+      - name: Archive production artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: companion-nightly
+          path:  ${{github.workspace}}/output
+          retention-days: 1
+
+  publish:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v2
+        with:
+          name: companion-nightly
+      - uses: eine/tip@master
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          tag: 'nightly'
+          rm: true
+          files: ./*