add force usage of cpu instructions, update GH actions

.github/workflows/build.yml

@@ -2,10 +2,12 @@ name: Build on Ubuntu
 
 on: [push, pull_request]
 
+defaults:
+  runs-on: ubuntu-16.04
+
 jobs:
   build:
     name: With USE_UPNP=${{ matrix.with_upnp }}
-    runs-on: ubuntu-16.04
     strategy:
       fail-fast: true
       matrix:
@@ -18,4 +20,19 @@ jobs:
         sudo apt-get update
         sudo apt-get install build-essential libboost1.74-dev libminiupnpc-dev libssl-dev zlib1g-dev
     - name: build application
-      run: make USE_AESNI=no USE_UPNP=${{ matrix.with_upnp }} -j3
+      run: make USE_UPNP=${{ matrix.with_upnp }} -j3
+
+  build_qt:
+    name: With QT GUI
+    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: |
+        cd qt/i2pd_qt
+        qmake
+        make -j3