Several refinements

fetch full repo history, needed for Changelog
switch to java11, it's current stable and we compile to java8 anyway
enable maven dependency caching for speed

Author: edeso

.github/workflows/maven.yml

@@ -16,9 +16,18 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
       with:
-        java-version: 1.8
+        fetch-depth: 0
+    - name: Set up JDK 11
+      uses: actions/setup-java@v2
+      with:
+        java-version: '11'
+        distribution: 'adopt'
+    - name: Cache Maven packages
+      uses: actions/cache@v2
+      with:
+        path: ~/.m2
+        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-m2
     - name: Build with Maven
-      run: mvn -B package --file pom.xml
+      run: mvn -B package -P snapshot