Replace Travis CI with GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: CI
+on:
+  - push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install qemu-utils
+        run: |
+          sudo apt-get update
+          sudo apt-get install qemu-utils
+
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run: |
+          sudo ./alpine-make-vm-image \
+              --image-format qcow2 \
+              --image-size 2G \
+              --repositories-file example/repositories \
+              --packages "$(cat example/packages)" \
+              --script-chroot \
+              alpine-virthardened-$(date +%Y-%m-%d).qcow2 -- ./example/configure.sh

.travis.yml

@@ -1,24 +0,0 @@
-dist: bionic
-sudo: required
-language: minimal
-addons:
-  apt:
-    packages:
-      - qemu-utils
-script:
-  - sudo ./alpine-make-vm-image
-        --image-format qcow2
-        --image-size 2G
-        --repositories-file example/repositories
-        --packages "$(cat example/packages)"
-        --script-chroot
-        alpine-virthardened-$(date +%Y-%m-%d).qcow2 -- ./example/configure.sh
-#deploy:
-#  provider: releases
-#  api_key:
-#    secure: <Encrypted GitHub Personal Token>
-#  file: "*.qcow2"
-#  file_glob: true
-#  skip_cleanup: true
-#  on:
-#    tags: true

README.adoc

@@ -5,11 +5,11 @@
 :version: 0.6.0
 
 ifdef::env-github[]
-image:https://travis-ci.org/{gh-name}.svg?branch=master["Build Status", link="https://travis-ci.org/{gh-name}"]
+image:https://github.com/{gh-name}/workflows/CI/badge.svg["Build Status", link="https://github.com/{gh-name}/actions"]
 endif::env-github[]
 
 This project provides a script for making customized https://alpinelinux.org/[Alpine Linux] disk images for virtual machines.
-It’s quite simple (300 LoC of shell), fast (~22 seconds on Travis CI, without Travis VM initialization) and requires minimum dependencies (QEMU and filesystem tools).
+It’s quite simple (300 LoC of shell), fast (~32 seconds on GitHub Actions) and requires minimum dependencies (QEMU and filesystem tools).
 
 TIP: Don’t need VM, just want to chroot into Alpine Linux (e.g. on CI)?
      Try https://github.com/alpinelinux/alpine-chroot-install[alpine-chroot-install]!
@@ -26,7 +26,7 @@ TIP: Don’t need VM, just want to chroot into Alpine Linux (e.g. on CI)?
 == Usage
 
 Read documentation in link:{script-name}[{script-name}].
-See link:.travis.yml[.travis.yml] for Travis example.
+See link:.github/workflows/ci.yml[] for GitHub Actions example.
 
 You can copy link:{script-name}[{script-name}] into your repository or download it on demand, e.g.: