gitlab: optimize CI job dependencies

Allow more parallelization by giving explicit dependencies between jobs.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

.gitlab-ci.yml

@@ -8,6 +8,7 @@ stages:
 .container_job_template: &container_job_definition
   image: docker:stable
   stage: containers
+  needs: []
   services:
     - docker:dind
   before_script:
@@ -132,62 +133,86 @@ ubuntu-2004-container:
 
 centos-8-git-build:
   <<: *git_build_job_definition
+  needs:
+    - centos-8-container
   variables:
     NAME: centos-8
 
 
 centos-7-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - centos-7-container
   variables:
     NAME: centos-7
 
 centos-8-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - centos-8-container
   variables:
     NAME: centos-8
 
 centos-stream-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - centos-stream-container
   variables:
     NAME: centos-stream
 
 debian-10-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - debian-10-container
   variables:
     NAME: debian-10
 
 debian-sid-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - debian-sid-container
   variables:
     NAME: debian-sid
 
 fedora-31-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - fedora-31-container
   variables:
     NAME: fedora-31
 
 fedora-32-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - fedora-32-container
   variables:
     NAME: fedora-32
 
 fedora-rawhide-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - fedora-rawhide-container
   variables:
     NAME: fedora-rawhide
 
 opensuse-151-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - opensuse-151-container
   variables:
     NAME: opensuse-151
     RPM: skip
 
 ubuntu-1804-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - ubuntu-1804-container
   variables:
     NAME: ubuntu-1804
 
 ubuntu-2004-dist-build:
   <<: *dist_build_job_definition
+  needs:
+    - ubuntu-2004-container
   variables:
     NAME: ubuntu-2004