Github Action to build and deply macOS

buildQGCandDeploy.yml: contains an action that triggers
upon tag push that will automatically build and deploy
the artifacts of the build (.dmg) to the assets of
the realse of the same name as the tag pushed.

.github/workflows/buildQGCandDeploy.yml

@@ -0,0 +1,76 @@
+name: Build QGC and upload to release 
+
+on: 
+    push:
+      #Every time a tag with name v* (e.g: vX.Y.Z) is pushed,
+      #this action will trigger.
+      tags:
+        - v*
+      #If instead of a tag (or with both restricctions simultaniously)
+      #you prefer to trigger the action uppon push on a branch,
+      #remove the "tags:" flag and add the "branches:" one. E.g:
+      #push:
+        #branches:
+          #- your_branch
+
+defaults:
+  run:
+    shell: bash
+
+env:
+  JOBS: 4
+  CONFIG: installer
+  ACTIONS_BUILD_DIR: ${{ github.workspace }}/../qgroundcontrol
+
+jobs:
+  build-job:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+        #Only running MacOS right now, but we leave this options 
+        #for future builds of all distros
+        exclude:
+          - os: ubuntu-latest
+          - os: windows-latest
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - name: install QT via action
+        uses: jurplel/install-qt-action@v2
+        with: 
+          version: '5.12.6'
+          host: 'mac'
+          target: 'desktop'
+          dir: '${{ runner.temp }}'
+          modules: 'qtcharts'
+          setup-python: 'false'
+
+      - name: Install Gstreamer
+        run:  |
+              wget --quiet https://qgroundcontrol.s3-us-west-2.amazonaws.com/dependencies/gstreamer-osx-1.18.1.tar.bz2
+              sudo tar -zxf gstreamer-osx-1.18.1.tar.bz2 -C /Library/Frameworks
+        
+      - name: mkdir directory shadow_build
+        run:  mkdir ${{ runner.temp }}/shadow_build_dir
+
+      - name: run qmake and build
+        working-directory: ${{ runner.temp }}/shadow_build_dir
+        run:  |
+              export JOBS=$((`sysctl -n hw.ncpu`+1))
+              qmake -r ${ACTIONS_BUILD_DIR}/qgroundcontrol.pro CONFIG+=${CONFIG}
+              make -j$JOBS
+
+      - name: Upload build artifacts to release
+        uses: svenstaro/upload-release-action@v2
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: ${{ runner.temp }}/shadow_build_dir/package/QGroundControl.dmg
+          asset_name: QGroundControl.dmg
+          tag: ${{ github.ref }}
+          overwrite: true
+          body: "QGgroundControl ${{ steps.get_version.outputs.VERSION }} test"