Integrate gitlab-ci/add-variable-for-manual-builds and 2 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@8e72eac2

Yocto build: add variable for manual builds

Instead of hard-coding the rules for manual builds in each actual job,
conditionally add this to the `buildbase` class and add a variable
`MANUAL_BUILD` to the according jobs.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@e6d71996

Yocto build: unify image and SDK build jobs

Image and SDK builds share a lot of similar code. Instead of having two
job classes `build_yocto_image` and `build_yocto_sdk` for these two
tasks, merge them into the base class `build_yocto` and make the
differences configurable via a variable.

The `dump_install_command` part of the script, which was not executed
for SDK builds, is always present now, but it's only executed if the
`INSTALLSCRIPT` variable is set, which is not the case for SDK builds.

The `collect_srcrevs` part of the script is executed in all cases. It
was not part of the SDK build before, but it's not less relevant there.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@f892500f

Yocto build: make main artifacts path configurable

Instead of specifying all possible artifacts paths and abusing the fact
that GitLab ignores non-existing paths during artifact upload, implement
a cleaner solution with a configurable path.

.gitlab-ci @ 8e72eac2

-Subproject commit c227e0531a0b9c6a2b23f6ec27ad0afe4bdac8c2
+Subproject commit 8e72eac2621d2791214220ff11f6bc3be47c2356

.gitlab-ci.yml

@@ -4,9 +4,9 @@
 # ---------------------------------------------------------------------------------------
 include:
   - project: '${CI_PROJECT_ROOT_NAMESPACE}/yocto/infrastructure/gitlab-ci'
-    ref: c227e0531a0b9c6a2b23f6ec27ad0afe4bdac8c2
+    ref: 8e72eac2621d2791214220ff11f6bc3be47c2356
     file: 'manifest-integration.yml'
 
 variables:
-  GITLAB_CI_REVISION: c227e0531a0b9c6a2b23f6ec27ad0afe4bdac8c2
+  GITLAB_CI_REVISION: 8e72eac2621d2791214220ff11f6bc3be47c2356
   BB_RECIPE_NAME: qt-multi-screen-compositor