🏗 Move from Travis CI to using GitHub Actions

Ref: https://help.github.com/en/github/automating-your-workflow-with-github-actions

.github/workflows/test.yml

@@ -0,0 +1,35 @@
+# For more information about the configurations used
+# in this file, please see the GitHub actions documentation.
+#
+# https://help.github.com/en/github/automating-your-workflow-with-github-actions/
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+jobs:
+
+  macOS:
+    runs-on: macOS-latest
+    steps:
+
+      - name: Checkout repository
+        uses: actions/checkout@v1
+
+      - name: Install dependencies
+        run: brew install shellcheck
+
+      - name: Run tests
+        run: ./tests/shellcheck.sh
+
+  ubuntu:
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Checkout repository
+        uses: actions/checkout@v1
+
+      - name: Run tests
+        run: ./tests/shellcheck.sh
+
+name: test
+
+on: push

README.md

@@ -1,4 +1,6 @@
-# [Cătălin](https://github.com/alrra)’s dotfiles [![Build Status](https://travis-ci.org/alrra/dotfiles.svg?branch=master)](https://travis-ci.org/alrra/dotfiles)
+# [Cătălin](https://github.com/alrra)’s dotfiles
+
+[![Build Status](https://github.com/alrra/dotfiles/workflows/test/badge.svg)](https://github.com/alrra/dotfiles/actions)
 
 These are the base dotfiles that I start with when I set up a
 new environment. For more specific local needs I use the `.local`