fix(ci): always unwind pushd in run_conditional_tests.sh

[akgitrepos]

Summary

• fixes a control-flow bug in ci/run_conditional_tests.sh where a failing package test exited the loop before popd, leaving the shell in a pushed directory
• keeps existing early-exit behavior on first failure (RETVAL + break) while guaranteeing directory stack cleanup
• adds a small trap-based guard so unexpected exits/signals (EXIT, INT, TERM) also unwind an outstanding pushd

Root Cause

Inside the test loop, the script did:

1. pushd ${d}
2. run test script and capture ret
3. if [ ${ret} -ne 0 ]; then ... break; fi
4. popd

When ret != 0, break was taken before popd, so cleanup was skipped.

What Changed

• introduced IN_PUSHED_DIR flag
• added cleanup_pushd() that conditionally performs popd > /dev/null || true
• registered trap cleanup_pushd EXIT INT TERM
• set IN_PUSHED_DIR=true immediately after pushd
• moved normal-path popd before failure break, then reset IN_PUSHED_DIR=false

Why This Is Safe

• no change to package selection logic, diff detection, credential gating, or test command execution
• still exits early on first failed package exactly as before
• cleanup function is no-op unless a pushd is currently active
• explicit popd remains in normal flow; trap is fallback for abnormal exits

Validation

• bash -n ci/run_conditional_tests.sh
• bash -n ci/run_single_test.sh

Risk Assessment

Low risk. Change is localized to directory-stack cleanup and does not alter core CI decision logic.

[akgitrepos]

@pearigee Made some quick fix to run_conditional_tests.sh. Would appreciate a review. Thank you!