Add .github configuration.

.github/FUNDING.yml

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+github: xwmx
+custom: https://paypal.me/WilliamMelody

.github/workflows/tests.yml

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+###############################################################################
+# .github/workflows/tests.yml
+#
+# NOTE: GitHub Actions does not allocate a TTY, preventing detection of
+# piped input using `[[ -t 0 ]]`.
+#
+# More information:
+#
+# https://github.com/actions/runner/issues/241
+#
+# faketty is a GitHub action that uses work-arounds to provide a tty:
+#
+# https://github.com/marketplace/actions/faketty
+#
+# Scripts used by faketty for each platform:
+#
+# linux: `faketty`
+#
+# ```bash
+# #!/bin/bash
+#
+# script -q -e -c "$*"
+# ```
+#
+# win32: `faketty.ps1`
+#
+# ```posh
+# Invoke-Expression "$args"
+# ```
+#
+# darwin: `faketty`
+#
+# requires: `brew install expect`
+#
+# ```bash
+# #!/bin/bash
+#
+# unbuffer $*
+# ```
+###############################################################################
+
+name: "hosts · Test Suite"
+
+on:
+  pull_request:
+    branches: [ master ]
+  push:
+    branches: [ master ]
+  workflow_dispatch:
+
+jobs:
+  test-macos-11:
+    name: "Test: macOS Big Sur 11.0"
+    runs-on: macos-11.0
+    steps:
+      - uses: actions/checkout@v3
+      - name: "Setup"
+        run: |
+          brew update
+          brew install bats-core
+          brew install expect
+      - name: "Set $TERM=xterm"
+        run:  printf "TERM=xterm\\n" >> $GITHUB_ENV
+      - name: "Run bats tests"
+        run:  unbuffer bats test
+  test-ubuntu-latest:
+    name: "Test: Ubuntu Latest"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: "Setup"
+        run: |
+          sudo apt-get update
+          sudo apt-get install bats -y
+      - name: "Install bats-core"
+        run: |
+          git clone https://github.com/bats-core/bats-core.git "${HOME}/bats-core" &&
+            cd "${HOME}/bats-core"
+          git checkout 2e2e5df6adf0b846b411b6b2f7bb654cbc3e2c4e
+          sudo ./install.sh /usr/local
+      - name: "Set $TERM=xterm"
+        run:  printf "TERM=xterm\\n" >> $GITHUB_ENV
+      - name: "Run bats tests"
+        run:  script -q -e -c "bats test"

.travis.yml

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-jobs:
-  include:
-    - os: linux
-      addons:
-        apt:
-          sources:
-            - sourceline: 'ppa:duggan/bats'
-          packages:
-            - bats
-      dist: bionic
-      language: minimal
-    - os: osx
-      before_install:
-        - brew install bats-core
-      osx_image: xcode11.3
-
-script: bats test
-

README.md

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-[![Build Status](https://travis-ci.org/xwmx/hosts.svg?branch=master)](https://travis-ci.org/xwmx/hosts)
+[![Build Status](https://img.shields.io/github/actions/workflow/status/xwmx/hosts/tests.yml?branch=master)](https://github.com/xwmx/hosts/actions)
 
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