ci: added github actions workflow

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+# This file is part of REANA.
+# Copyright (C) 2020 CERN.
+#
+# REANA is free software; you can redistribute it and/or modify it
+# under the terms of the MIT License; see LICENSE file for more details.
+
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build-docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Build image
+        run: make build
+
+      - name: Test image
+        run: make test

Makefile

@@ -7,7 +7,7 @@ build: Dockerfile
 	docker build -t $(IMAGE) .
 
 test:
-	docker run -i -t --rm $(IMAGE) klist 2>&1 | grep "klist: No credentials"
+	docker run -i --rm $(IMAGE) klist 2>&1 | grep "klist: No credentials"
 
 push:
 	docker push $(IMAGE)

README.rst

@@ -2,8 +2,8 @@
 REANA Authentication Kerberos5
 ==============================
 
-.. image:: https://img.shields.io/travis/reanahub/reana-auth-krb5.svg
-   :target: https://travis-ci.org/reanahub/reana-auth-krb5
+.. image:: https://github.com/reanahub/reana-auth-krb5/workflows/CI/badge.svg
+      :target: https://github.com/reanahub/reana-auth-krb5/actions
 
 .. image:: https://badges.gitter.im/Join%20Chat.svg
    :target: https://gitter.im/reanahub/reana?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge