Fix anonymous-mode and GHES token routing for all platforms

Thread 1&2 (linux/macos): guard gh api path with [[ -n \ ]] so anonymous callers fall through to the unauthenticated curl path instead of letting gh api fail on GitHub-hosted runners where gh is always installed.

Thread 3 (windows): build REST API base URL from GH_HOST so GHES environments resolve releases against the configured host instead of hard-coded api.github.com.

Thread 4 (action.yml): add GH_ENTERPRISE_TOKEN to all three step env blocks; GitHub CLI requires this variable (not GH_TOKEN) when talking to a non-github.com host.

Author: MariusStorhaug

action.yml

@@ -50,6 +50,7 @@ runs:
         PRERELEASE: ${{ inputs.Prerelease }}
         GITHUB_TOKEN: ${{ inputs.Token }}
         GH_TOKEN: ${{ inputs.Token }}
+        GH_ENTERPRISE_TOKEN: ${{ inputs.Token }}
         GH_HOST: ${{ inputs.Host }}
       run: bash ./scripts/linux/install.sh
 
@@ -62,6 +63,7 @@ runs:
         PRERELEASE: ${{ inputs.Prerelease }}
         GITHUB_TOKEN: ${{ inputs.Token }}
         GH_TOKEN: ${{ inputs.Token }}
+        GH_ENTERPRISE_TOKEN: ${{ inputs.Token }}
         GH_HOST: ${{ inputs.Host }}
       run: bash ./scripts/macos/install.sh
 
@@ -74,5 +76,6 @@ runs:
         PRERELEASE: ${{ inputs.Prerelease }}
         GITHUB_TOKEN: ${{ inputs.Token }}
         GH_TOKEN: ${{ inputs.Token }}
+        GH_ENTERPRISE_TOKEN: ${{ inputs.Token }}
         GH_HOST: ${{ inputs.Host }}
       run: ./scripts/windows/install.ps1

scripts/linux/install.sh

@@ -7,7 +7,7 @@ echo "Prerelease: [$PRERELEASE]"
 
 github_api_get() {
   local endpoint="$1"
-  if command -v gh >/dev/null 2>&1; then
+  if command -v gh >/dev/null 2>&1 && [[ -n "$GH_TOKEN" ]]; then
     local gh_args=()
     if [[ -n "$GH_HOST" ]]; then
       gh_args+=(--hostname "$GH_HOST")

scripts/macos/install.sh

@@ -7,7 +7,7 @@ echo "Prerelease: [$PRERELEASE]"
 
 github_api_get() {
   local endpoint="$1"
-  if command -v gh >/dev/null 2>&1; then
+  if command -v gh >/dev/null 2>&1 && [[ -n "$GH_TOKEN" ]]; then
     local gh_args=()
     if [[ -n "$GH_HOST" ]]; then
       gh_args+=(--hostname "$GH_HOST")

scripts/windows/install.ps1

@@ -12,8 +12,13 @@ if ($req -and $req.Trim().ToLower() -eq 'latest') {
     if ($env:GITHUB_TOKEN) {
         $headers['Authorization'] = "Bearer $($env:GITHUB_TOKEN)"
     }
+    $apiBase = if ($env:GH_HOST -and $env:GH_HOST -ne 'github.com') {
+        "https://$($env:GH_HOST)/api/v3"
+    } else {
+        'https://api.github.com'
+    }
     if ($env:PRERELEASE -eq 'true') {
-        $releases = Invoke-RestMethod -Uri 'https://api.github.com/repos/PowerShell/PowerShell/releases?per_page=100' -Headers $headers
+        $releases = Invoke-RestMethod -Uri "$apiBase/repos/PowerShell/PowerShell/releases?per_page=100" -Headers $headers
         $latestRelease = $releases | Where-Object { $_.prerelease -eq $true } | Select-Object -First 1
         if (-not $latestRelease) {
             Write-Host 'Error: No prerelease PowerShell releases are available from GitHub.'
@@ -22,7 +27,7 @@ if ($req -and $req.Trim().ToLower() -eq 'latest') {
         $latest = $latestRelease.tag_name.TrimStart('v')
         Write-Host "Latest prerelease PowerShell version detected: $latest"
     } else {
-        $latest = (Invoke-RestMethod -Uri 'https://api.github.com/repos/PowerShell/PowerShell/releases/latest' -Headers $headers).tag_name.TrimStart('v')
+        $latest = (Invoke-RestMethod -Uri "$apiBase/repos/PowerShell/PowerShell/releases/latest" -Headers $headers).tag_name.TrimStart('v')
         if (-not $latest) {
             Write-Host 'Error: Failed to resolve latest stable PowerShell release from GitHub.'
             exit 1