build: GitHub CI updated

.github/workflows/conan-ci.yml

@@ -26,7 +26,7 @@ on: [push, pull_request]
 
 jobs:
   conan:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
@@ -39,13 +39,9 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: '3.8'
-      - name: Upgrade pip
-        run: |
-          python -m pip install --upgrade pip
       - name: Install Conan
         run: |
           pip install -U conan_package_tools
-          conan config init
       - name: Run
         env:
           CONAN_LOGIN_USERNAME: ${{ secrets.CONAN_LOGIN_USERNAME }}
@@ -59,28 +55,29 @@ jobs:
   docs:
     needs: conan
     name: Documentation
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     env:
       CC: gcc-10
       CXX: g++-10
     steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.8'
       - name: Install dependencies
         run: |
-          sudo apt install -y gcc-10 g++-10
           pip install -Ur docs/requirements.txt
-
       - name: Install Conan
         run: |
           pip install -U conan
           conan config init
-
+      - name: Generate
-      - name: Build
         run:
           mkdir build && cd build
           conan install .. -e CONAN_RUN_TESTS=True
           cmake ..
           cmake --build . --target sphinx
-      
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3
         with: