VCPKG_DEFAULT_BINARY_CACHE not working when looking for cached archives

[cryptomilk]

Describe the bug
I'm trying to use binary caching for gitlab windows runners.

vcpkg looks for 023dd0049c752931548a69400b380edc1da48022.zip in C:\Users\gitlab_runner\AppData\Local\vcpkg\archives instead of C:\GitLab-Runner\builds\cryptomilk\libssh-mirror\.vcpkg\archives defined by VCPKG_DEFAULT_BINARY_CACHE environment variable!

Log snippet:

$ If (!(test-path .vcpkg\archives)) { mkdir -p .vcpkg\archives }
    Directory: C:\GitLab-Runner\builds\cryptomilk\libssh-mirror\.vcpkg
Mode                LastWriteTime         Length Name                                                                  
----                -------------         ------ ----                                                                  
d-----        5/26/2021   2:23 PM                archives                                                              
$ ls .vcpkg
    Directory: C:\GitLab-Runner\builds\cryptomilk\libssh-mirror\.vcpkg
Mode                LastWriteTime         Length Name                                                                  
----                -------------         ------ ----                                                                  
d-----        5/26/2021   2:23 PM                archives                                                              
$ ls .vcpkg\archives
$ $env:VCPKG_DEFAULT_BINARY_CACHE="$PWD\.vcpkg\archives"
$ echo $env:VCPKG_DEFAULT_BINARY_CACHE
C:\GitLab-Runner\builds\cryptomilk\libssh-mirror\.vcpkg\archives
$ $env:VCPKG_DEFAULT_TRIPLET="x64-windows"
$ vcpkg install cmocka
Computing installation plan...
The following packages will be built and installed:
    cmocka[core]:x64-windows
Detecting compiler hash for triplet x64-windows...
A suitable version of git was not found (required v2.26.2). Downloading portable git v2.26.2...
Downloading git...
  https://github.com/git-for-windows/git/releases/download/v2.26.2.windows.1/PortableGit-2.26.2-32-bit.7z.exe -> C:\vcpkg\downloads\PortableGit-2.26.2-32-bit.7z.exe
Extracting git...
A suitable version of 7zip was not found (required v18.1.0). Downloading portable 7zip v18.1.0...
Downloading 7zip...
  https://www.nuget.org/api/v2/package/7-Zip.CommandLine/18.1.0 -> C:\vcpkg\downloads\7-zip.commandline.18.1.0.nupkg
Extracting 7zip...
A suitable version of nuget was not found (required v5.5.1). Downloading portable nuget v5.5.1...
Downloading nuget...
  https://dist.nuget.org/win-x86-commandline/v5.5.1/nuget.exe -> C:\vcpkg\downloads\22ea847d-nuget.exe
A suitable version of powershell-core was not found (required v6.2.1). Downloading portable powershell-core v6.2.1...
Downloading powershell-core...
  https://github.com/PowerShell/PowerShell/releases/download/v6.2.1/PowerShell-6.2.1-win-x86.zip -> C:\vcpkg\downloads\PowerShell-6.2.1-win-x86.zip
Extracting powershell-core...
Starting package 1/1: cmocka:x64-windows
Building package cmocka[core]:x64-windows...
Could not locate cached archive: C:\Users\gitlab_runner\AppData\Local\vcpkg\archives\02\023dd0049c752931548a69400b380edc1da48022.zip

Full log:
https://gitlab.com/cryptomilk/libssh-mirror/-/jobs/1295357514

Environment

• OS: Windows 1809
• Compiler: MSVC 19.26.28806.0

To Reproduce
Steps to reproduce the behavior:

1. mkdir -p .vcpkg\archives
2. $env:VCPKG_DEFAULT_BINARY_CACHE="$PWD.vcpkg\archives"
3. ./vcpkg install cmocka
4. Could not locate cached archive: C:\Users\gitlab_runner\AppData\Local\vcpkg\archives...

Expected behavior
If VCPKG_DEFAULT_BINARY_CACHE env variable it set, it should search this location for cached archives.

Failure logs
https://gitlab.com/cryptomilk/libssh-mirror/-/jobs/1295357514

Sidenote
It correctly stores it in the cache set via VCPKG_DEFAULT_BINARY_CACHE, it just doesn't load it from there ... :-)

Stored binary cache: C:\Users\gitlab_runner\AppData\Local\vcpkg\archives\02\023dd0049c752931548a69400b380edc1da48022.zip

[JackBoosY]

cc @ras0219 @ras0219-msft

[JonLiu1993]

@cryptomilk ,This issue has been solved, I have tested it locally, please update vcpkg and use.