CI: use bash style variable expansion for the mingw cache key
authorChristoph Reiter <reiter.christoph@gmail.com>
Wed, 6 May 2020 19:19:52 +0000 (21:19 +0200)
committerChristoph Reiter <reiter.christoph@gmail.com>
Wed, 6 May 2020 19:23:14 +0000 (21:23 +0200)
commit94202e63395ba591949c4c0218fd8cf6fc3a2b69
treee7a47edb222badf300aed662eff9d3cc477b2c90
parent5815604853930bb70eeffa8d12b33f157d898db6
CI: use bash style variable expansion for the mingw cache key

It doesn't understand the powershell syntax which leads to the cache
key being empty which leads to cache restore being skipped
which leads to slow builds not using ccache.

See https://gitlab.com/gitlab-org/gitlab-runner/-/issues/2747
.gitlab-ci.yml