While checking T362425 I found the composer installation of dev dependencies downloads artifacts:
```
11:31:10 - Downloading squizlabs/php_codesniffer (3.8.1)
11:31:10 - Downloading dealerdirect/phpcodesniffer-composer-installer (v1.0.0)
11:31:10 - Downloading composer/pcre (3.1.4)
11:31:10 - Downloading psr/cache (1.0.1)
11:31:10 - Downloading doctrine/deprecations (1.1.3)
11:31:10 - Downloading doctrine/event-manager (1.2.0)
```
As if there was no cache at all... Fun times.
Repro:
```
$ ssh integration-agent-docker-1042
$ mkdir cache
$ sudo docker run -e HOME=/tmp --rm -it -e CASTOR_HOST=integration-castor05.integration.eqiad1.wikimedia.cloud -e JOB_NAME=mediawiki-quibble-vendor-mysql-php74 -e ZUUL_PROJECT=mediawiki/core -e ZUUL_BRANCH=master -e CASTOR_NAMESPACE="mediawiki-core/master/mediawiki-quibble-vendor-mysql-php74" -v cache:/cache docker-registry.wikimedia.org/releng/castor:0.3.0 load
Defined: CASTOR_NAMESPACE="mediawiki-core/master/mediawiki-quibble-vendor-mysql-php74"
Syncing...
rsync: [generator] failed to set times on "/tmp/.": Operation not permitted (1)
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1819) [generator=3.2.3]
Done
```