Add maven source plugin if not exists on maven-release

.github/workflows/maven-release.yml

@@ -75,6 +75,28 @@ jobs:
       env:
         SETTINGS_XML: ${{ secrets.MVN_SETTINGS_XML }}
 
+    - name: Add maven-source-plugin to POM
+      run: |
+        if ! grep -q "maven-source-plugin" pom.xml; then
+          echo "maven-source-plugin not found in pom.xml, adding it..."
+          sed -i '/<plugins>/a \
+                <plugin>\
+                    <groupId>org.apache.maven.plugins</groupId>\
+                    <artifactId>maven-source-plugin</artifactId>\
+                    <version>3.3.1</version>\
+                    <executions>\
+                        <execution>\
+                            <id>attach-sources</id>\
+                            <goals>\
+                                <goal>jar-no-fork</goal>\
+                            </goals>\
+                        </execution>\
+                    </executions>\
+                </plugin>' pom.xml
+        else
+          echo "maven-source-plugin already exists in pom.xml"
+        fi
+
     - name: Maven release
       run: |
         mvn org.apache.maven.plugins:maven-release-plugin:3.1.0:prepare -B -DrepositoryId=pravila--pravila-maven -DconnectionUrl=$REPO_URL