GitHub Actions: split the workflows (#15403)

.github/workflows/amd64_linux_clang.yml

@@ -0,0 +1,20 @@
+name: amd64_linux_clang
+
+on: [push, pull_request]
+
+jobs:
+
+  amd64_linux_clang:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - run: sudo apt -y -qq update
+    - run: sudo apt install -y clang cmake qt5-default libqt5webkit5-dev python
+      name: Install requirements
+    - run: clang++ --version && cmake --version && qmake --version && python --version
+      name: Display tools version
+    - run: CC=clang CXX=clang++ ./configure
+    - run: make
+    - run: file ./bin/phantomjs
+    - run: ./bin/phantomjs --version
+    - run: make check

.github/workflows/amd64_linux_gcc.yml

@@ -0,0 +1,21 @@
+name: amd64_linux_gcc
+
+on: [push, pull_request]
+
+jobs:
+
+  amd64_linux_gcc:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - run: sudo apt -y -qq update
+    - run: sudo apt install -y g++ cmake qt5-default libqt5webkit5-dev python
+      name: Install requirements
+    - run: g++ --version && cmake --version && qmake --version && python --version
+      name: Display tools version
+    - run: ./configure
+    - run: make
+    - run: file ./bin/phantomjs
+    - run: ./bin/phantomjs --version
+    - run: make check
+

.github/workflows/tests.yml

@@ -1,40 +0,0 @@
-name: Tests
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-
-  amd64_linux_clang:
-    runs-on: ubuntu-18.04
-    steps:
-    - uses: actions/checkout@v2
-    - run: sudo apt -y -qq update
-    - run: sudo apt install -y clang cmake qt5-default libqt5webkit5-dev python
-      name: Install requirements
-    - run: clang++ --version && cmake --version && qmake --version && python --version
-      name: Display tools version
-    - run: CC=clang CXX=clang++ ./configure
-    - run: make
-    - run: file ./bin/phantomjs
-    - run: ./bin/phantomjs --version
-    - run: make check
-
-  amd64_linux_gcc:
-    runs-on: ubuntu-18.04
-    steps:
-    - uses: actions/checkout@v2
-    - run: sudo apt -y -qq update
-    - run: sudo apt install -y g++ cmake qt5-default libqt5webkit5-dev python
-      name: Install requirements
-    - run: g++ --version && cmake --version && qmake --version && python --version
-      name: Display tools version
-    - run: ./configure
-    - run: make
-    - run: file ./bin/phantomjs
-    - run: ./bin/phantomjs --version
-    - run: make check
-