Add Continuous Integration for Linux with GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,98 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build-on-ubuntu1804:
+    runs-on: ubuntu-18.04
+    env:
+      RUNS_ON: ubuntu1804
+    steps:
+    - name: Install OS dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y \
+          build-essential \
+          cmake \
+          freeglut3-dev \
+          g++ \
+          libcurl4-openssl-dev \
+          libfontconfig-dev \
+          libgl1-mesa-dev \
+          libgtk2.0-dev \
+          mesa-common-dev \
+          unzip
+    - name: Get GCC version
+      run: gcc --version
+    - name: Get libc version
+      run: ldd --version
+
+    - name: Install wxWidgets
+      run: |
+        sudo apt-get install -y libwxgtk*-dev
+        sudo ln -s $(which wx-config) /usr/local/bin/wx-config-3
+        wx-config-3 --cflags | grep I
+
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Build LK
+      run: |
+        cmake -Bbuild_linux -DCMAKE_BUILD_TYPE=Debug
+        cmake --build build_linux -- -j
+
+    - name: Save static lib & lksandbox
+      uses: actions/upload-artifact@v2
+      with:
+        name: LK-${{ env.RUNS_ON }}-x86_64
+        path: |
+          build_linux/lk_sandbox*
+          build_linux/lk*.a
+
+  build-on-ubuntu2004:
+    runs-on: ubuntu-20.04
+    env:
+      RUNS_ON: ubuntu2004
+    steps:
+    - name: Install OS dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y \
+          build-essential \
+          cmake \
+          freeglut3-dev \
+          g++ \
+          libcurl4-openssl-dev \
+          libfontconfig-dev \
+          libgl1-mesa-dev \
+          libgtk2.0-dev \
+          mesa-common-dev \
+          unzip
+    - name: Get GCC version
+      run: gcc --version
+    - name: Get libc version
+      run: ldd --version
+
+    - name: Install wxWidgets
+      run: |
+        sudo apt-get install -y libwxgtk*-dev
+        sudo ln -s $(which wx-config) /usr/local/bin/wx-config-3
+        wx-config-3 --cflags | grep I
+
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Build LK
+      run: |
+        cmake -Bbuild_linux -DCMAKE_BUILD_TYPE=Debug
+        cmake --build build_linux -- -j
+
+    - name: Save static lib & lksandbox
+      uses: actions/upload-artifact@v2
+      with:
+        name: LK-${{ env.RUNS_ON }}-x86_64
+        path: |
+          build_linux/lk_sandbox*
+          build_linux/lk*.a