* [CI] Key the vcpkg binary cache per ABI and let pull requests heal it
The cache had no prefix, and TAServers/vcpkg-cache restores every entry it
finds under the prefix rather than only the hashes vcpkg asks for. With all
legs sharing the single vcpkg/ namespace, each of the five of them downloads
all 66 archives of all five on every run. Each restore also refreshes the
entry's last access date, so a dead ABI generation stays fresh forever and
GitHub's least recently used eviction can never reach it.
Name the scope in the key after the platform, target and toolchain it belongs
to, so a leg restores only its own archives. macOS 14, 15 and 26 on the same
Xcode build identical binaries when they share the lowest deployment target,
so point all three at 14 and let them share one scope instead of three.
A pull request cannot write the shared cache either. Its entries are scoped to
refs/pull/<n>/merge, so nothing it saves is ever readable again, and letting
it write anyway only burns the repository's quota, which is what the previous
attempt at this did. Keep the build read-only and hand the archives it had to
build itself to a new workflow running in the default branch scope, which
saves them where master can restore them. Forks stay read-only, they are the
one case whose archives must not be trusted.
Because the prefix changes every key, add a job that deletes the entries of
retired scopes, which is the one-time clean up of the current flat namespace,
and the per-run ones pull requests leave behind, which age based eviction
also never reaches.
Also pin the Linux ccache cache to its own subdirectory, since the directory
is shared with the docker build context, and drop the clang-format install
from the build images, which format nothing at runtime.
* [CI] Create the vcpkg cache directory when a scope is still empty
* [CI] Let a pull request write the vcpkg archives it builds
* [CI] Upload the vcpkg handover as one archive instead of loose files
* [CI] Hand the vcpkg cache over from one leg per scope
* [CI] Gate vcpkg cache writes to master pushes
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Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
