try to migrate from Travis CI to GitHub Actions

Author: notaz

.github/workflows/ci-linux.yml

@@ -0,0 +1,15 @@
+name: CI (Linux)
+on: [push, pull_request]
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install dependencies
+      run: |
+        sudo apt-get update -qq
+        sudo apt-get install -y libsdl1.2-dev libasound2-dev libpng-dev libz-dev
+    - name: configure
+      run: ./configure
+    - name: make
+      run: make

.travis.yml

@@ -1,7 +1,7 @@
 PCSX-ReARMed - yet another PCSX fork
 ====================================
 
-[![Build Status](https://travis-ci.org/notaz/pcsx_rearmed.svg?branch=master)](https://travis-ci.org/notaz/pcsx_rearmed)
+![CI (Linux)](https://github.com/notaz/pcsx_rearmed/workflows/CI%20(Linux)/badge.svg)
 
 *see [readme.txt](readme.txt) for more complete documentation*