Enabling Maven profiles for JDK21 and JDK25. Separate builds can be enabled on for these using a simple

```
mvn clean install -P<jdk21/jdk25>
```

This assumes that there are explicit `JAVA_HOME_21` and `JAVA_HOME_25` which are set.

PiperOrigin-RevId: 797843586
Change-Id: Id7dd6c8b01922f3124efc4cbfa1cbcf78ef00830

Author: maigovannon

.github/workflows/maven.yml

@@ -33,6 +33,13 @@ jobs:
         os: [ubuntu-latest]
         java: [17, 21, 25-ea]
         jdk: [temurin]
+        include:
+          - java: 17
+            maven_profile: ""
+          - java: 21
+            maven_profile: "-Pjdk21"
+          - java: 25-ea
+            maven_profile: "-Pjdk25"
       fail-fast: false
 
     runs-on: ${{ matrix.os }}
@@ -48,7 +55,15 @@ jobs:
           java-version: ${{ matrix.java }}
           cache: 'maven'
 
+      - name: Set JAVA_HOME for specific versions
+        run: |
+          if [[ "${{ matrix.java }}" == "21" ]]; then
+            echo "JAVA_HOME_21=$JAVA_HOME" >> $GITHUB_ENV
+          elif [[ "${{ matrix.java }}" == "25-ea" ]]; then
+            echo "JAVA_HOME_25=$JAVA_HOME" >> $GITHUB_ENV
+          fi
+
       - name: Build with Maven
         run: |
-          ./mvnw clean install -B -q
+          ./mvnw clean install -B -q ${{ matrix.maven_profile }}
           echo "done"

pom.xml

@@ -205,6 +205,44 @@
         </repository>
       </repositories>
       </profile>
+      <profile>
+          <id>jdk21</id>
+          <properties>
+              <maven.compiler.release>21</maven.compiler.release>
+              <maven.compiler.source>21</maven.compiler.source>
+              <maven.compiler.target>21</maven.compiler.target>
+          </properties>
+          <build>
+              <plugins>
+                  <plugin>
+                      <groupId>org.apache.maven.plugins</groupId>
+                      <artifactId>maven-compiler-plugin</artifactId>
+                      <configuration>
+                          <executable>${env.JAVA_HOME_21}/bin/javac</executable>
+                      </configuration>
+                  </plugin>
+              </plugins>
+          </build>
+      </profile>
+      <profile>
+          <id>jdk25</id>
+          <properties>
+              <maven.compiler.release>25</maven.compiler.release>
+              <maven.compiler.source>25</maven.compiler.source>
+              <maven.compiler.target>25</maven.compiler.target>
+          </properties>
+          <build>
+              <plugins>
+                  <plugin>
+                      <groupId>org.apache.maven.plugins</groupId>
+                      <artifactId>maven-compiler-plugin</artifactId>
+                      <configuration>
+                          <executable>${env.JAVA_HOME_25}/bin/javac</executable>
+                      </configuration>
+                  </plugin>
+              </plugins>
+          </build>
+      </profile>
   </profiles>
 
   <dependencyManagement>