Add CI using G++ (#2)

.github/workflows/build.yml

@@ -0,0 +1,20 @@
+name: Compile code
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Install dependencies
+        if: matrix.os == 'windows-latest'
+        run: |
+          choco install mingw
+      - name: Build
+        run: |
+          g++ -o multiplication_tables ./src/multiplication_tables.cpp
+          echo 2 | ./multiplication_tables

.gitpod.yml

@@ -15,7 +15,5 @@ github:
 vscode:
   extensions:
   # - ms-vscode.cpptools
-    - twxs.cmake
-    - ms-vscode.cmake-tools
     - notskm.clang-tidy
-    - DavidAnson.vscode-markdownlint@0.36.1:qV04OEElMWIf9PHKK19GYA==
+    - DavidAnson.vscode-markdownlint@0.36.1