Migrate from Travis CI to GitHub actions

.github/workflows/maven-build.yml

@@ -0,0 +1,26 @@
+# This workflow will build a Java project with Maven, and cache/restore any dependencies to improve the workflow execution time
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
+
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 11
+      uses: actions/setup-java@v2
+      with:
+        java-version: '11'
+        distribution: 'adopt'
+        cache: maven
+    - name: Build with Maven
+      run: mvn -B package --file pom.xml

README.md

@@ -1,6 +1,7 @@
 # Distributed version of the Spring PetClinic Sample Application built with Spring Cloud 
 
-[![Build Status](https://travis-ci.org/spring-petclinic/spring-petclinic-microservices.svg?branch=master)](https://travis-ci.org/spring-petclinic/spring-petclinic-microservices/) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+[![Build Status](https://github.com/spring-petclinic/spring-petclinic-microservices/actions/workflows/maven-build.yml/badge.svg)](https://github.com/spring-petclinic/spring-petclinic-microservices/actions/workflows/maven-build.yml)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 
 This microservices branch was initially derived from [AngularJS version](https://github.com/spring-petclinic/spring-petclinic-angular1) to demonstrate how to split sample Spring application into [microservices](http://www.martinfowler.com/articles/microservices.html).
 To achieve that goal we use Spring Cloud Gateway, Spring Cloud Circuit Breaker, Spring Cloud Config, Spring Cloud Sleuth, Resilience4j, Micrometer