Set SETUPTOOLS_SCM_PRETEND_VERSION for hardlink source copies

Hardlink copies (cp -al / rsync --link-dest) share the same .git/index
inode across all config directories. When parallel builds invoke
setuptools_scm, concurrent git status calls on the shared index cause
timeouts on Lustre. Bypass git entirely by setting the pretend version.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson

.github/scripts/run_frontier_all_benchmarks.sh

@@ -46,6 +46,9 @@ for cfg in "${configs[@]}"; do
 done
 
 # --- Phase 2: Build all configs on login node in parallel ---
+# Avoid setuptools_scm git conflicts in hardlink copies (shared .git/index)
+export SETUPTOOLS_SCM_PRETEND_VERSION=0.0.0
+
 MAX_PARALLEL=2
 
 echo ""

.github/scripts/run_frontier_all_tests.sh

@@ -51,6 +51,9 @@ for cfg in "${configs[@]}"; do
 done
 
 # --- Phase 2: Build all configs on login node in parallel ---
+# Avoid setuptools_scm git conflicts in hardlink copies (shared .git/index)
+export SETUPTOOLS_SCM_PRETEND_VERSION=0.0.0
+
 MAX_PARALLEL=2
 
 echo ""