Migrate workflow from maven to gradle

.github/workflows/gradle.yml

@@ -0,0 +1,26 @@
+# This workflow will build a Java project with Gradle 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-gradle
+
+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 8
+      uses: actions/setup-java@v2
+      with:
+        java-version: '8'
+        distribution: 'zulu'
+        cache: gradle
+    - name: Build with Gradle
+      run: ./gradlew build

.github/workflows/maven.yml

@@ -1,27 +0,0 @@
-name: Publish to Github Packages
-
-on: 
-  push:
-    branches:
-      - master
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
-      with:
-        java-version: 1.8
-    - name: Build with Maven
-      run: mvn -B package --file pom.xml -pl '!brouter-routing-app'
-    - name: Deploy to Github Package Registry
-      env:
-        GITHUB_USERNAME: x-access-token
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        GITHUB_REPOSITORY: ${{ github.repository }}
-      run:
-        mvn --settings settings.xml deploy -pl '!brouter-routing-app'

settings.xml

@@ -1,39 +0,0 @@
-<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" 
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
-                      http://maven.apache.org/xsd/settings-1.0.0.xsd">
-
-    <activeProfiles>
-        <activeProfile>github</activeProfile>
-    </activeProfiles>
-
-    <profiles>
-        <profile>
-            <id>github</id>
-            <repositories>
-                <repository>
-                    <id>central</id>
-                    <url>https://repo1.maven.org/maven2</url>
-                    <releases>
-                        <enabled>true</enabled>
-                    </releases>
-                    <snapshots>
-                        <enabled>true</enabled>
-                    </snapshots>
-                </repository>
-                <repository>
-                    <id>github</id>
-                    <name>GitHub Cyface Apache Maven Packages</name>
-		    <url>https://maven.pkg.github.com/${env.GITHUB_REPOSITORY}</url>
-                </repository>
-            </repositories>
-        </profile>
-    </profiles>
-
-    <servers>
-        <server>
-            <id>github</id>
-            <username>${env.GITHUB_USERNAME}</username>
-            <password>${env.GITHUB_TOKEN}</password>
-        </server>
-    </servers>
-</settings>