Merge branch 'development' into 'master'

.gitattributes

.gitignore

.gitlab-ci.yml

CHANGELOG.md

CONTRIBUTING.md

LICENSE.header.java

build.gradle.kts

gradle.properties

gradle/wrapper/gradle-wrapper.jar

gradle/wrapper/gradle-wrapper.properties

gradlew

gradlew.bat

scripts/migration-cross-branch-test.sh

scripts/migration-mysql-test.sh

scripts/migration-postgres-test.sh

src/main/java/nl/tudelft/queue/DevDatabaseLoader.java

src/main/java/nl/tudelft/queue/PageUtil.java

src/main/java/nl/tudelft/queue/QueueApplication.java

...n/java/nl/tudelft/queue/cache/AssignmentCacheManager.java

...main/java/nl/tudelft/queue/cache/ClusterCacheManager.java