ccpp.yml: Changes

Build all branches.
Delete whitespace.
Use checkout v2.
Change ; to &&.
Use working-directory instead of cd.
Add -j to speed up build.

.github/workflows/ccpp.yml

@@ -1,13 +1,6 @@
 name: SDL/Ubuntu
 
-on:
-  push:
-    branches: 
-      - master
-
-  pull_request:
-    branches: 
-      - master
+on: [push, pull_request]
 
 jobs:
   build:
@@ -15,8 +8,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Install dependencies
-      run: sudo apt-get --allow-releaseinfo-change update; sudo apt-get --fix-missing install libsdl2-dev scons
+      run: sudo apt-get --allow-releaseinfo-change update && sudo apt-get --fix-missing install libsdl2-dev scons
     - name: Make
-      run: cd OSBindings/SDL; scons
+      working-directory: OSBindings/SDL
+      run: scons -j$(nproc --all)