Integrate gitlab-ci/add-confluence-stage and 2 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@f8c1d732

Add confluence stage

This adds two jobs to the Yocto pipeline:

 - generate-confluence-page
 - publish-confluence-page

The first one generates a confluence page from a template
(`confluence-page.xml.jinja2`) using information downloaded from all
successful "Deploy FTP" jobs of the same pipeline.

The second one publishes this page in Confluence and displays a link to
the new page. If the page already exists it is overwritten.

The place in Confluence where the new page is published is configurable
via the `CONFLUENCE_SPACE` and `CONFLUENCE_PARENT_ID` variables.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@fee9493b

generate-build-pipeline: re-add YAML format parsing

This was accidentally forgotten in the previous commit.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@9b777f29

Rename "generate_job_from_template" script to "render_jinja2_template"

This makes the script more general and open for other future purposes.
The parsing of the YAML content is conditional now, depending on the new
"format" argument.

.gitlab-ci @ f8c1d732

-Subproject commit b20f6b95e2c8dca7d6c4a621259ff22ee5d62dd4
+Subproject commit f8c1d732dac071905c1992f5c2f432a98d7bef75

.gitlab-ci.yml

@@ -4,9 +4,9 @@
 # ---------------------------------------------------------------------------------------
 include:
   - project: '${CI_PROJECT_ROOT_NAMESPACE}/yocto/infrastructure/gitlab-ci'
-    ref: b20f6b95e2c8dca7d6c4a621259ff22ee5d62dd4
+    ref: f8c1d732dac071905c1992f5c2f432a98d7bef75
     file: 'manifest-integration.yml'
 
 variables:
-  GITLAB_CI_REVISION: b20f6b95e2c8dca7d6c4a621259ff22ee5d62dd4
+  GITLAB_CI_REVISION: f8c1d732dac071905c1992f5c2f432a98d7bef75
   BB_RECIPE_NAME: u-boot-imx