minor #13961 [GH] Store composer lock and generate diff (lchrusciel)
minor #13961 [GH] Store composer lock and generate diff (lchrusciel)

This PR was merged into the 1.10 branch.

Discussion
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| Q               | A                                                            |
|-----------------|--------------------------------------------------------------|
| Branch?         | 1.10 |
| Bug fix?        | no                                                      |
| New feature?    | no                                                       |
| BC breaks?      | no                                                       |
| Deprecations?   | no |
| Related tickets | |
| License         | MIT                                                          |

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This PR is meant to produce an easily readable diff of dependencies changed between PR and branch into which the PR is opened. 

PoC: https://github.com/lchrusciel/Sylius/pull/56

Commits
-------

3d8a3ede0e8a69c59bf10b6ca40ea298c62111ca [GH] Store composer lock and generate diff

SyliusBot/Sylius,diimpp/Sylius,101medialab/Sylius,Zales0123/Sylius,SyliusBot/Sylius,diimpp/Sylius,Sylius/Sylius,101medialab/Sylius,Sylius/Sylius,Zales0123/Sylius,diimpp/Sylius,101medialab/Sylius,loic425/Sylius,Sylius/Sylius,Zales0123/Sylius,SyliusBot/Sylius,loic425/Sylius,loic425/Sylius