Backport of [HPR-941] Update plugin loading documentation into release/1.9.x #12492
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Backport
This PR is auto-generated from #12485 to be assessed for backporting due to the inclusion of the label backport/1.9.x.
The below text is copied from the body of the original PR.
Packer checks a number of directories for plugins upon initialization, with the introduction of multi-component plugins and underlying changes to the Packer SDK the ordering changed slightly. These changes update the related documentation to reflect the new ordering, and adds a plugin loading ordering section to the docs to help users discover how plugin loading works.
Include in this change are updates to the PACKER_CONFIG_DIR environment variables to reflect the XDG base directory specification used as the default Packer configuration directory layout.
Closes #11972
Previews:
🔍 Configuring Packer
🔎 Plugin Loading Order