fix(nextflow): propagate DOCKER_API_VERSION to fix Docker client version mismatch

The Docker client bundled in nextflow/nextflow images reports API version 1.32,
but Docker Desktop >= 4.x requires a minimum of 1.44. This causes all Nextflow
runs to fail immediately with:

  docker: Error response from daemon: client version 1.32 is too old.
  Minimum supported API version is 1.44, please upgrade your client.

Fix by:
1. Setting DOCKER_API_VERSION=1.44 in the Nextflow container environment,
   which the Docker client reads to override its reported version.
2. Writing a sapporo.config with `docker.envWhitelist = 'DOCKER_API_VERSION'`
   so Nextflow propagates the variable into all child process containers.

The same fix was already applied to run_cwltool(), run_toil(), run_ep3(), and
run_streamflow() — this brings run_nextflow() in line with those.

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

Author: inutano

sapporo/run.sh

@@ -60,13 +60,21 @@ function run_cwltool() {
 
 function run_nextflow() {
     local container="nextflow/nextflow:25.10.4"
+    # Write a Nextflow config that propagates DOCKER_API_VERSION into child containers.
+    # This is required on Docker Desktop >= 4.x where the minimum supported API version
+    # is 1.44, but the Docker client bundled in nextflow/nextflow images reports 1.32.
+    local nf_config="${exe_dir}/sapporo.config"
+    cat > "${nf_config}" <<'NFCFG'
+docker.envWhitelist = 'DOCKER_API_VERSION'
+NFCFG
     local -a cmd_arr=(docker run --rm
         -v /var/run/docker.sock:/var/run/docker.sock
         -e DOCKER_HOST=unix:///var/run/docker.sock
+        -e DOCKER_API_VERSION=1.44
         -v "${run_dir}:${run_dir}"
         "-w=${exe_dir}"
         "${container}"
-        nextflow run "${wf_url}")
+        nextflow run "${wf_url}" -c "${nf_config}")
     _append_engine_params cmd_arr
     cmd_arr+=(-params-file "${wf_params}" --outdir "${outputs_dir}" -work-dir "${exe_dir}")
     _write_and_run cmd_arr