jacoco lost the test

No tests executed, so no coverage.

---

In build log you have

[INFO] Tests are skipped.

which is probably due to -DskipTests in your .github/workflows/build.yml

run: mvn -B clean package -DskipTests

---

Execution of mvn test produces

[INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ bridge ---
[INFO]
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 0, Failures: 0, Errors: 0, Skipped: 0

because you have junit-jupiter in dependencies, but don’t have junit-vintage-engine (see output of mvn dependency:tree), while your tests are written using JUnit 4.

---

After the following removal of exclusion of junit-vintage-engine

             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
+            <!--
             <exclusions>
                 <exclusion>
                     <groupId>org.junit.vintage</groupId>
                     <artifactId>junit-vintage-engine</artifactId>
                 </exclusion>
             </exclusions>
+            -->

Execution of mvn test produces

[INFO] Tests run: 47, Failures: 0, Errors: 0, Skipped: 0

and the following report