Lutz Justen d2b594a41d Fix build caching (#43) ...

There were two problems:
- Writing the date on Windows used the wrong syntax. In Powershell,
  env variables are addressed as $env:NAME, not $NAME.
- Use different caches for opt vs fastbuild. We are currently using
  opt caches for fastbuilds, which results in lots of cache misses.

2022-12-08 08:38:23 +01:00

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workflows

Fix build caching (#43)

2022-12-08 08:38:23 +01:00