Use actions/checkout

action.yml

@@ -7,6 +7,11 @@ branding:
 
 inputs:
 
+  # checkout
+  checkout-fetch-depth:
+    description: 'Number of commits to fetch'
+    required: false
+
   # java jdk params
 
   java-version:
@@ -60,6 +65,14 @@ runs:
 
   steps:
 
+    - run: echo "::group::Checkout"
+      shell: bash
+    - uses: actions/checkout@v2.3.4
+      with:
+        fetch-depth: '${{ inputs.checkout-fetch-depth }}'
+    - run: echo "::endgroup::"
+      shell: bash
+
     - run: echo "::group::Setup Java"
       shell: bash
     - uses: actions/setup-java@v2.3.0