potiuk commented on PR #45266:
URL: https://github.com/apache/airflow/pull/45266#issuecomment-2564804750
> One question-> does the PR workflow build uses cache? from where it uses
is it from github registry?
PRs are using cache from the artifacts. If you look at the
`ci-image-build.xml`, we are attempting to download the cached artifact image
and load it to the registry (the load command will only run when
"stash/restore" command will have a cache hit:
```yaml
- name: "Restore CI docker image ${{ inputs.platform }}:${{
env.PYTHON_MAJOR_MINOR_VERSION }}"
uses:
apache/infrastructure-actions/stash/restore@c94b890bbedc2fc61466d28e6bd9966bc6c6643c
with:
key: "ci-image-save-${{ inputs.platform }}-${{
env.PYTHON_MAJOR_MINOR_VERSION }}"
path: "/tmp/"
id: restore-ci-image
- name: "Load CI image ${{ inputs.platform }}:${{
env.PYTHON_MAJOR_MINOR_VERSION }}"
run: breeze ci-image load --platform ${{ inputs.platform }}
shell: bash
if: steps.restore-ci-image.stash-hit == 'true'
```
This is the nice thing with using `stash` action - because it will download
artifacts "up" the hierarchy when it finds it (see
https://github.com/apache/infrastructure-actions/tree/main/stash#features)
1) It will try to attempt to find cache in current workflow (it will not
find any because we have not built an image yet)
2) It will look for cache in previous action runs of the current branch
(which means that even if you modify Dockerfile or other scripts, the cached
image uploaded in previous run of your PR will be used subsequent runs of the
same PR within 2 days should be faster
3) If it does not find it (first time you run your PR) - it will look for
the same artifact in the target branch (`main` or `v-*-test`) - which will be
the last "canary" built image
Which is EXACTLY what we need.
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