fix command

Author: adriangb

.github/workflows/pr_benchmarks.yml

@@ -86,13 +86,13 @@ jobs:
           export CARGO_COMMAND="cargo run --release"
           
           # start compiling the branch (in the background)
-          cd pr_branch/benchmarks
+          pushd pr_branch/benchmarks
           export BRANCH_NAME=`git rev-parse --abbrev-ref HEAD`
           ${CARGO_COMMAND} --bin tpch >> build.log 2>&1 &
           ${CARGO_COMMAND} --bin parquet >> build.log 2>&1 &
           ${CARGO_COMMAND} --bin dfbench >> build.log 2>&1 &
           popd
-          cd base_branch/benchmarks
+          pushd base_branch/benchmarks
           ${CARGO_COMMAND} --bin tpch >> build.log 2>&1 &
           ${CARGO_COMMAND} --bin parquet >> build.log 2>&1 &
           ${CARGO_COMMAND} --bin dfbench >> build.log 2>&1 &