fix(ci): improve vcpkg root detection in CI and release workflows

- Added checks to set the vcpkgRoot variable from environment variables RUNVCPKG_VCPKG_ROOT and VCPKG_ROOT if it is not already defined.
- Enhances the reliability of vcpkg setup by ensuring the correct root path is utilized during the build process.

Benefits:
- Increases robustness in CI and release workflows by providing fallback options for vcpkg root detection, improving build consistency.

.github/workflows/ci.yml

@@ -103,6 +103,12 @@ jobs:
         if ([string]::IsNullOrWhiteSpace($vcpkgRoot)) {
           $vcpkgRoot = "${{ steps.vcpkg_retry.outputs.vcpkgRoot }}"
         }
+        if ([string]::IsNullOrWhiteSpace($vcpkgRoot) -and $env:RUNVCPKG_VCPKG_ROOT) {
+          $vcpkgRoot = $env:RUNVCPKG_VCPKG_ROOT
+        }
+        if ([string]::IsNullOrWhiteSpace($vcpkgRoot) -and $env:VCPKG_ROOT) {
+          $vcpkgRoot = $env:VCPKG_ROOT
+        }
         if ([string]::IsNullOrWhiteSpace($vcpkgRoot)) {
           Write-Host "::error::lukka/run-vcpkg did not emit vcpkgRoot"
           exit 1

.github/workflows/release.yml

@@ -177,6 +177,12 @@ jobs:
           if ([string]::IsNullOrWhiteSpace($vcpkgRoot)) {
             $vcpkgRoot = "${{ steps.vcpkg_retry.outputs.vcpkgRoot }}"
           }
+          if ([string]::IsNullOrWhiteSpace($vcpkgRoot) -and $env:RUNVCPKG_VCPKG_ROOT) {
+            $vcpkgRoot = $env:RUNVCPKG_VCPKG_ROOT
+          }
+          if ([string]::IsNullOrWhiteSpace($vcpkgRoot) -and $env:VCPKG_ROOT) {
+            $vcpkgRoot = $env:VCPKG_ROOT
+          }
           if ([string]::IsNullOrWhiteSpace($vcpkgRoot)) {
             Write-Host "::error::lukka/run-vcpkg did not emit vcpkgRoot"
             exit 1