CI: work around vcpkg openssl issue with OpenSSL providers
Currently, the openssl package from vcpkg uses an incorrect, hard-coded default location for OpenSSL providers under C:\vcpkg\packages, which is supposed to be a temporary directory.
Override it with the OPENSSL_MODULES environment variable as a temporary workaround.
CI: work around vcpkg openssl issue with OpenSSL providers
Currently, the openssl package from vcpkg uses an incorrect, hard-coded
default location for OpenSSL providers under C:\vcpkg\packages, which
is supposed to be a temporary directory.
Override it with the OPENSSL_MODULES environment variable as a
temporary workaround.