Action for testing project creation

[yariksheptykin]

Closes #302
This PR backports pimcore/skeleton@73f0b4d to pimcore's demo.

[CLAassistant]

All committers have signed the CLA.

[yariksheptykin]

A test run of this action can be found in my fork under https://github.com/yariksheptykin/demo/actions/runs/2060852960

[dvesh3]

@yariksheptykin thanks for your PR! 👍 could you please sign the CLA?

[jdreesen]

@CLAassistant seems to be a bit confused. How can it be signed and not-signed with only one commit?

[yariksheptykin]

@yariksheptykin thanks for your PR! +1 could you please sign the CLA?

I tried to sign CLA multiple times yesterday. The CLA page renders blank to me and I cannot proceed. I managed to do it once somehow, but apparently this introduced even more confusion. Not sure how to get it fixed.

[yariksheptykin]

@CLAassistant does not seem to be awake yet.

[dvesh3]

Ohh wait. It looks good in the checks

The comment above is confusing as first it shows signed then not signed. I'll delete the wrong comment manually to avoid confusion.

[yariksheptykin]

@CLAassistant seems to be a bit confused. How can it be signed and not-signed with only one commit?

It's a "Schrödingers CLA"

[fashxp]

everything seems alright, found you in the list 👍.

[yariksheptykin]

@dvesh3 while porting this action to demo I noticed a tiny bug. The composer project was created in php8.0 environment, whereas pimcore installation ran under php8.1 as defined in docker-compose.yml file.
This changeset already corrects the issue. For the skeleton there is a PR pimcore/skeleton#87

[dvesh3]

@yariksheptykin thanks a lot!