build: Possible fix for release build failure

build was failing due to the hard coded "-SNAPSHOT" lib version in
core module's Ballerina.toml file. During the release process all
version's get modified into non snapshot version. Therefore ballerina
endsup falling to identify the lib in provided path.
This solution will try to solve the issue by replacing the toml file
value to current project version during the build process.

components/micro-gateway-core/pom.xml

@@ -150,6 +150,27 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <artifactId>maven-antrun-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>process-resources</phase>
+                        <goals>
+                            <goal>run</goal>
+                        </goals>
+                        <configuration>
+                            <tasks>
+                                <replaceregexp
+                                    file="src/main/ballerina/Ballerina.toml"
+                                    match="org\.wso2\.micro\.gateway\.core-.*.jar"
+                                    replace="org.wso2.micro.gateway.core-${project.version}.jar"
+                                    byline="true"/>
+                            </tasks>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
         </plugins>
 
     </build>