Add github actions to check Java Import are sorted.

.github/actions/sortimport/action.yml

@@ -0,0 +1,40 @@
+name: "Check Java Import"
+description: "Check Java Import are well sorted with Maven"
+
+runs:
+  using: "composite"
+  steps:
+
+  - name: Check Java Import
+    id: sort_import
+    shell: bash
+    run: mvn -B impsort:check
+
+  - name: Add comment
+    if: failure()
+    uses: marocchino/sticky-pull-request-comment@v2
+    with:
+      header: Java Import check Failed
+      message: |
+        :x: **Java Import are not sorted !** [(more details)](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})
+
+        Ensure your code build locally using: 
+        ```
+        mvn clean install
+        ```
+        Or just validate java import with : 
+        ```
+        mvn impsort:check
+        ```
+        You can sort Java import with : 
+        ```
+        mvn impsort:sort
+        ```
+        See also [How configure your IDE](https://github.com/eclipse/leshan/wiki/Code-&-design-guidelines#configure-your-ide).
+
+  - name: Delete comment
+    if: success()
+    uses: marocchino/sticky-pull-request-comment@v2
+    with:
+      header: Code Formatter Validation Failed
+      delete: true

.github/workflows/main.yml

@@ -40,11 +40,17 @@ jobs:
       id: build
       uses: ./.github/actions/build
 
+    - name: Java Import Check
+      if: always()
+      id: sortimport
+      uses: ./.github/actions/sortimport
+
     - name: Code Style Check
       if: always()
       id: checkstyle
       uses: ./.github/actions/checkstyle
 
+
     - name: Check Android API Compliance
       if: ${{ always() && steps.build.conclusion == 'success' }}
       uses: ./.github/actions/android-check

pom.xml

@@ -133,6 +133,7 @@ Contributors:
                 <revapi.skip>true</revapi.skip>
                 <formatter.skip>true</formatter.skip>
                 <checkstyle.skip>true</checkstyle.skip>
+                <impsort.skip>true</impsort.skip>
             </properties>
         </profile>
     </profiles>