GitHub Actions for Linux (#65)

* Added Github Actions CI for Linux

Author: solomonjoseph

.github/workflows/integrate.yml

@@ -0,0 +1,23 @@
+name: Integrate
+
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: before_install
+      run: |
+        sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+        sudo apt-get -q update
+        sudo apt-get install build-essential git libboost-all-dev cmake libgmp3-dev libssl-dev libsodium-dev libprocps-dev pkg-config gcc-5 g++-5
+    - name: before_script
+      run: |
+        git submodule init && git submodule update
+        mkdir build && cd build && cmake ..
+    - name: tests
+      run: |
+        cd build
+        make
+        make check