ci: avoid symlinking the build directory on self-hosted builders

src/ci/scripts/symlink-build-dir.sh

@@ -12,7 +12,7 @@ source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
 if isWindows && isAzurePipelines; then
     cmd //c "mkdir c:\\MORE_SPACE"
     cmd //c "mklink /J build c:\\MORE_SPACE"
-elif isLinux && isGitHubActions; then
+elif isLinux && isGitHubActions && ! isSelfHostedGitHubActions; then
     sudo mkdir -p /mnt/more-space
     sudo chown -R "$(whoami):" /mnt/more-space
 

src/ci/shared.sh

@@ -38,6 +38,11 @@ function isGitHubActions {
     [[ "${GITHUB_ACTIONS-false}" = "true" ]]
 }
 
+
+function isSelfHostedGitHubActions {
+    [[ "${RUST_GHA_SELF_HOSTED-false}" = "true" ]]
+}
+
 function isMacOS {
     [[ "${OSTYPE}" = "darwin"* ]]
 }