gitlab: don't block container / build jobs on DCO check

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

.gitlab-ci.yml

@@ -1,7 +1,7 @@
 stages:
-  - prebuild
   - containers
   - builds
+  - sanity_checks
 
 .container_job_template: &container_job_definition
   image: docker:stable
@@ -120,7 +120,8 @@ stages:
 # this test on developer's personal forks from which
 # merge requests are submitted
 check-dco:
-  stage: prebuild
+  stage: sanity_checks
+  needs: []
   image: registry.gitlab.com/libvirt/libvirt-ci/check-dco:master
   script:
     - /check-dco virt-viewer
@@ -195,7 +196,7 @@ mingw64-fedora-rawhide-container:
 
 
 codestyle:
-  stage: builds
+  stage: sanity_checks
   image: $CI_REGISTRY_IMAGE/ci-centos-8:latest
   needs:
     - x86-centos-8-container
@@ -207,6 +208,8 @@ codestyle:
 
 x86-centos-7-dist-build:
   <<: *dist_native_build_job_definition
+  needs:
+    - x86-centos-7-container
   variables:
     NAME: centos-7
     # git is too old for -C args
@@ -215,59 +218,81 @@ x86-centos-7-dist-build:
 
 x86-centos-8-git-build:
   <<: *git_native_build_job_definition
+  needs:
+    - x86-centos-8-container
   variables:
     NAME: centos-8
     RPM: skip
 
 x86-centos-stream-dist-build:
   <<: *git_native_build_job_definition
+  needs:
+    - x86-centos-stream-container
   variables:
     NAME: centos-stream
     RPM: skip
 
 x86-debian-10-dist-build:
   <<: *dist_native_build_job_definition
+  needs:
+    - x86-debian-10-container
   variables:
     NAME: debian-10
 
 x86-debian-sid-dist-build:
   <<: *dist_native_build_job_definition
+  needs:
+    - x86-debian-sid-container
   variables:
     NAME: debian-sid
 
 x86-fedora-32-dist-build:
   <<: *dist_native_build_job_definition
+  needs:
+    - x86-fedora-32-container
   variables:
     NAME: fedora-32
 
 x86-fedora-33-dist-build:
   <<: *dist_native_build_job_definition
+  needs:
+    - x86-fedora-33-container
   variables:
     NAME: fedora-33
 
 x86-fedora-rawhide-dist-build:
   <<: *dist_native_build_job_definition
+  needs:
+    - x86-fedora-rawhide-container
   variables:
     NAME: fedora-rawhide
 
 x86-opensuse-152-dist-build:
   <<: *dist_native_build_job_definition
+  needs:
+    - x86-opensuse-152-container
   variables:
     NAME: opensuse-152
     RPM: skip
 
 x86-ubuntu-1804-dist-build:
   <<: *dist_native_build_job_definition
+  needs:
+    - x86-ubuntu-1804-container
   variables:
     NAME: ubuntu-1804
 
 x86-ubuntu-2004-dist-build:
   <<: *dist_native_build_job_definition
+  needs:
+    - x86-ubuntu-2004-container
   variables:
     NAME: ubuntu-2004
 
 mingw32-fedora-rawhide-git-build:
   <<: *git_cross_build_default_job_definition
+  needs:
+    - mingw32-fedora-rawhide-container
   variables:
     NAME: fedora-rawhide-cross-mingw32
   artifacts:
@@ -279,6 +304,8 @@ mingw32-fedora-rawhide-git-build:
 
 mingw64-fedora-rawhide-git-build:
   <<: *git_cross_build_default_job_definition
+  needs:
+    - mingw64-fedora-rawhide-container
   variables:
     NAME: fedora-rawhide-cross-mingw64
   artifacts: