Integrate gitlab-ci/add_git_credentials_script and 2 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@42bfe4f0

build:prepare: Add setup script for Git Credentials

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@24653ff8

build:machines: Add i.MX93 to the build job template

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@7aae72ea

Re-enable sourcery

With the free open source plan, sourcery works only when called from the
repository's root directory. Re-enable it by calling it from there.

Also apply sourcery's suggestions to file generate_firmware_package.py,
which did not exist before disabling sourcery.

.gitlab-ci @ 42bfe4f0

-Subproject commit 51e0cf67dc5961134ef4bd3e7a1b1659ab95dd63
+Subproject commit 42bfe4f0d8f51e894f64a2ffa59732d777c137b3

.gitlab-ci.yml

@@ -4,8 +4,8 @@
 # ---------------------------------------------------------------------------------------
 include:
   - project: '${CI_PROJECT_ROOT_NAMESPACE}/yocto/infrastructure/gitlab-ci'
-    ref: 51e0cf67dc5961134ef4bd3e7a1b1659ab95dd63
+    ref: 42bfe4f0d8f51e894f64a2ffa59732d777c137b3
     file: 'manifest-integration.yml'
 
 variables:
-  GITLAB_CI_REVISION: 51e0cf67dc5961134ef4bd3e7a1b1659ab95dd63
+  GITLAB_CI_REVISION: 42bfe4f0d8f51e894f64a2ffa59732d777c137b3