[actions] add builder on ubuntu (from main repo)

Signed-off-by: R4SAS <r4sas@i2pmail.org>

.github/workflows/build.yml

@@ -0,0 +1,19 @@
+name: Build on Ubuntu
+
+on: [push, pull_request]
+
+jobs:
+  build_qt:
+    name: With QT GUI
+    runs-on: ubuntu-16.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: |
+        sudo add-apt-repository ppa:mhier/libboost-latest
+        sudo apt-get update
+        sudo apt-get install build-essential qt5-default libqt5gui5 libboost1.74-dev libminiupnpc-dev libssl-dev zlib1g-dev
+    - name: build application
+      run: |
+        qmake
+        make -j3