Added build workflow and fixed build issues

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: Build
+
+on:
+  - push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - uses: eskatos/gradle-command-action@v1
+        with:
+          gradle-version: 5.6.2
+          arguments: build -x test -x distTar
+      - uses: actions/upload-artifact@v1
+        with:
+          name: VZD-Client
+          path: build/distributions

build.gradle

@@ -10,7 +10,6 @@ buildscript {
         classpath 'de.gematik:documentation-plugin:1.1.2'
     }
     repositories {
-        mavenCentral()
         jcenter()
         maven { url 'https://jitpack.io' }
         maven { url "https://plugins.gradle.org/m2/" }

src/main/resources/jaxb-binding/binding.xml

@@ -3,7 +3,7 @@
    version="2.0"
    xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
-    <jaxb:bindings schemaLocation="..\\xsd\\commands.xsd" node="/xs:schema">
+    <jaxb:bindings schemaLocation="../xsd/commands.xsd" node="/xs:schema">
         <jaxb:globalBindings fixedAttributeAsConstantProperty="true"/>
     </jaxb:bindings>