Try to increase speed of CI

Author: SadiJr

.gitlab-ci.yml

@@ -151,7 +151,7 @@ build-backend-skip-tests:
     - cloudstack
   script:
     - echo "Building backend with 'mvn clean install -DskipTests -Dnoredist'..."
-    - mvn clean install -DskipTests -Dnoredist
+    - mvn clean install -DskipTests -Dnoredist -T $(nproc)
     - echo "Done building backend with 'mvn clean install -DskipTests -Dnoredist'."
 
 build-backend-combined:
@@ -164,7 +164,7 @@ build-backend-combined:
     - cloudstack
   script:
     - echo "Building backend with 'mvn clean install -Dnoredist -Psystemvm,developer -Dsystemvm'..."
-    - mvn clean install -Dnoredist -Psystemvm,developer -Dsystemvm
+    - mvn clean install -Dnoredist -Psystemvm,developer -Dsystemvm -T $(nproc)
     - echo "Done building backend with 'mvn clean install -Dnoredist -Psystemvm,developer -Dsystemvm'"
 
 #####################
@@ -178,7 +178,7 @@ generate-deb-packages:
     - cloudstack
   script:
     - echo "Generating .deb Ubuntu Focal Fossa packages..."
-    - docker run -v $CI_PROJECT_DIR:/mnt/build/cloudstack -v ~/.m2:/root/.m2 -e "USER_ID=$(id -u)" -e "USER_GID=$(id -g)" -e "ACS_BUILD_OPTS=-Dnoredist" scclouds/cloudstack-deb-builder:ubuntu2004-jdk11-python3
+    - docker run -v $CI_PROJECT_DIR:/mnt/build/cloudstack -v ~/.m2:/root/.m2 -e "USER_ID=$(id -u)" -e "USER_GID=$(id -g)" -e "ACS_BUILD_OPTS=-Dnoredist -T $(nproc)" scclouds/cloudstack-deb-builder:ubuntu2004-jdk11-python3
     - echo "Done generating .deb packages."
   artifacts:
     expire_in: 12h