Add Codecov coverage reporting to Maven workflow (#11)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Garciat <118277+Garciat@users.noreply.github.com>

Author: Copilot

.github/workflows/maven.yml

@@ -19,3 +19,8 @@ jobs:
         cache: maven
     - name: Build with Maven
       run: mvn clean verify package
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v5
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        fail_ci_if_error: true

README.md

@@ -1,5 +1,7 @@
 # Type Class resolution for Java
 
+[![codecov](https://codecov.io/gh/Garciat/java-type-classes/branch/main/graph/badge.svg)](https://codecov.io/gh/Garciat/java-type-classes)
+
 See: https://garciat.com/posts/java-type-classes/
 
 The core API of this library is:

pom.xml

@@ -89,6 +89,25 @@
           <artifactId>maven-surefire-plugin</artifactId>
           <version>3.5.4</version>
         </plugin>
+        <plugin>
+          <groupId>org.jacoco</groupId>
+          <artifactId>jacoco-maven-plugin</artifactId>
+          <version>0.8.12</version>
+          <executions>
+            <execution>
+              <goals>
+                <goal>prepare-agent</goal>
+              </goals>
+            </execution>
+            <execution>
+              <id>report</id>
+              <phase>verify</phase>
+              <goals>
+                <goal>report</goal>
+              </goals>
+            </execution>
+          </executions>
+        </plugin>
         <plugin>
           <artifactId>maven-jar-plugin</artifactId>
           <version>3.5.0</version>
@@ -126,6 +145,10 @@
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
       </plugin>
+      <plugin>
+        <groupId>org.jacoco</groupId>
+        <artifactId>jacoco-maven-plugin</artifactId>
+      </plugin>
     </plugins>
   </build>
 </project>