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Document caching with merge-queue

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@ -120,7 +120,7 @@ cache-disabled: true
By default, the `gradle-build-action` will only write to the cache from Jobs on the default (`main`/`master`) branch.
Jobs on other branches will read entries from the cache but will not write updated entries.
See [Optimizing cache effectiveness](#optimizing-cache-effectiveness) for a more detailed explanation.
See [Optimizing cache effectiveness](#select-which-branches-should-write-to-the-cache) for a more detailed explanation.
In some circumstances it makes sense to change this default, and to configure a workflow Job to read existing cache entries but not to write changes back.
@ -314,19 +314,22 @@ There are some techniques that can be used to avoid/mitigate this issue:
### Select which branches should write to the cache
GitHub cache entries are not shared between builds on different branches.
This means that each PR branch will have it's own Gradle User Home cache, and will not benefit from cache entries written by other PR branches.
An exception to this is that cache entries written in parent and upstream branches are visible to child branches, and cache entries for the default (`master`/`main`) branch can be read by actions invoked for any other branch.
Workflow runs can restore caches created in either the current branch or the default branch (usually main).
This means that each branch will have it's own Gradle User Home cache scope, and will not benefit from cache entries written for other (non-default) branches.
By default, the `gradle-build-action` will only _write_ to the cache for builds run on the default (`master`/`main`) branch.
Jobs run on other branches will only read from the cache. In most cases, this is the desired behaviour,
because Jobs run against other branches will benefit from the cache Gradle User Home from `main`,
without writing private cache entries that could lead to evicting shared entries.
Jobs run on other branches will only read from the cache. In most cases, this is the desired behavior.
This is because Jobs run on other branches will benefit from the cache Gradle User Home from `main`,
without writing private cache entries that which could lead to evicting these shared entries.
If you have other long-lived development branches that would benefit from writing to the cache,
you can configure these by overriding the `cache-read-only` action parameter.
you can configure this by disabling the `cache-read-only` action parameter for these branches.
See [Using the cache read-only](#using-the-cache-read-only) for more details.
Similarly, you could use `cache-read-only` for certain jobs in the workflow, and instead have these jobs reuse the cache content from upstream jobs.
Note there are some cases where writing cache entries is typically unhelpful (these are disabled by default):
- For `pull_request` triggered runs, the cache scope is limited to the merge ref (`refs/pull/.../merge`) and can only be restored by re-runs of the pull request.
- For `merge_queue` triggered runs, the cache scope is limited to a temporary branch with a special prefix created to validate pull request changes.
### Exclude content from Gradle User Home cache