Configure mvn to run with more heap space to allow running tests.

This is necessary, since there is a memory leak in mastodon (mastodon-sc/mastodon#225)

.github/workflows/build.yml

@@ -22,4 +22,6 @@ jobs:
           distribution: 'zulu'
           cache: 'maven'
       - name: Build with Maven
+        env:
+          MAVEN_OPTS: -Xmx4096m
         run: mvn -B package --file pom.xml

.github/workflows/sonarcloud.yml

@@ -50,6 +50,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # Needed to get PR information
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }} # Generate a token on Sonarcloud.io, add it to the secrets of this repo with the name SONAR_TOKEN (Settings > Secrets > Actions > add new repository secret)
+          MAVEN_OPTS: -Xmx4096m
         run: mvn -B verify --file pom.xml -Pcoverage sonar:sonar -Dsonar.projectKey=mastodon-sc_mastodon-deep-lineage -Dsonar.organization=mastodon-sc
 
       - name: Upload artifacts for subsequent review