install dependencies

Author: andreasbuhr

.github/workflows/cmake.yml

@@ -12,7 +12,7 @@ jobs:
     # well on Windows or Mac.  You can convert this to a matrix build if you need
     # cross-platform coverage.
     # See: https://docs.github.com/en/actions/configuring-and-managing-workflows/configuring-a-workflow#configuring-a-build-matrix
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     strategy:
       matrix:
@@ -21,6 +21,12 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
+    - name: Install ppa
+      run: sudo add-apt-repository ppa:ubuntu-toolchain-r/ppa
+
+    - name: Install dependencies
+      run: sudo apt-get install g++-10
+
     - name: Create Build Environment
       # Some projects don't allow in-source building, so create a separate build directory
       # We'll use this as our working directory for all subsequent commands