ci: fix on demand condition

Author: Zijian Zhang

ci/build_env_image.sh

@@ -6,16 +6,16 @@ GIT_COMMIT_SHA=${GIT_COMMIT_SHA:?"GIT_COMMIT_SHA is not set"}
 
 echo "GIT_COMMIT_SHA: $GIT_COMMIT_SHA"
 
+RUN_ID="areal-$GIT_COMMIT_SHA"
+cd "/tmp/$RUN_ID"
+
 # If there is already an image for the current environment, skip the build.
 ENV_SHA=$(sha256sum pyproject.toml | awk '{print $1}')
 if docker images --format '{{.Repository}}:{{.Tag}}' | grep -q "areal-env:$ENV_SHA"; then
     echo "Image areal-env already exists, skipping build."
     exit 0
 fi
 
-RUN_ID="areal-$GIT_COMMIT_SHA"
-cd "/tmp/$RUN_ID"
-
 if docker ps -a --format '{{.Names}}' | grep -q "$RUN_ID"; then
     docker rm -f $RUN_ID
 fi