ci: switch distribution to Temurin and fix Maven Central setup logic

- Updated GitHub workflow to use the 'temurin' distribution instead of 'adopt'.
- Added a second `setup-java` step to ensure Maven Central settings are correctly configured after the initial setup.

Author: poikilotherm

.github/workflows/maven-snapshot.yml

@@ -16,7 +16,7 @@ jobs:
               uses: actions/setup-java@v4
               with:
                   java-version: ${{ matrix.java }}
-                  distribution: 'adopt'
+                  distribution: 'temurin'
                   server-id: central
                   server-username: MAVEN_USERNAME
                   server-password: MAVEN_PASSWORD
@@ -28,6 +28,16 @@ jobs:
                   restore-keys: ${{ runner.os }}-m2
             - name: Build, test, verify and publish snapshot
               run: mvn -B verify -Djdk.version=${{ matrix.java }}
+
+            # Running setup-java again overwrites the settings.xml - IT'S MANDATORY TO DO THIS SECOND SETUP!!!
+            - name: Set up Maven Central Repository
+              uses: actions/setup-java@v4
+              with:
+                java-version: ${{ env.JAVA_VERSION }}
+                distribution: 'temurin'
+                server-id: central
+                server-username: MAVEN_USERNAME
+                server-password: MAVEN_PASSWORD
             - name: Publish snapshot
               if: ${{ matrix.java == '17' }}
               run: mvn deploy -pl '!report,!xoai-data-provider-tck' -DskipUT -DskipIT -Djdk.version=${{ matrix.java }}