remove macOS from github actions

Author: luk036

.github/workflows/documentation.yaml

@@ -11,7 +11,7 @@ env:
 jobs:
   build:
     name: Build and publish documentation
-    runs-on: macos-latest
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
 
@@ -35,7 +35,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          brew install doxygen
+          sudo apt-get install doxygen
           pip3 install jinja2 Pygments
 
       - name: Build

.github/workflows/macos.yml renamed to .github/workflows/macos.old

@@ -15,7 +15,7 @@ env:
 
 jobs:
   build:
-    runs-on: macos-latest
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v2
@@ -40,7 +40,7 @@ jobs:
 
       - name: Install format dependencies
         run: |
-          brew install clang-format
+          sudo apt-get install clang-format
           pip3 install cmake_format==0.6.11 pyyaml
 
       - name: configure