Add spn testing setup

spn/testing/simple/run.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+cd "$( dirname "${BASH_SOURCE[0]}" )"
+
+realpath() {
+    path=`eval echo "$1"`
+    folder=$(dirname "$path")
+    echo $(cd "$folder"; pwd)/$(basename "$path"); 
+}
+
+leftovers=$(docker ps -a | grep spn-test-simple | cut -d" " -f1)
+if [[ $leftovers != "" ]]; then
+  docker stop $leftovers
+  docker rm $leftovers
+fi
+
+if [[ ! -f "../../../cmds/hub/hub" ]]; then
+  echo "please build the hub cmd using cmds/hub/build"
+  exit 1
+fi
+
+# Create variables.
+SPN_TEST_BIN="$(realpath ../../../cmds/hub/hub)"
+SPN_TEST_DATA_DIR="$(realpath ./testdata)"
+if [[ ! -d "$SPN_TEST_DATA_DIR" ]]; then
+  mkdir "$SPN_TEST_DATA_DIR"
+fi
+SPN_TEST_SHARED_DATA_DIR="$(realpath ./testdata/shared)"
+if [[ ! -d "$SPN_TEST_SHARED_DATA_DIR" ]]; then
+  mkdir "$SPN_TEST_SHARED_DATA_DIR"
+fi
+
+# Check if there is an old binary for testing.
+SPN_TEST_OLD_BIN=$SPN_TEST_BIN
+if [[ -f "./testdata/old-hub" ]]; then
+  SPN_TEST_OLD_BIN="$(realpath ./testdata/old-hub)"
+  echo "WARNING: running in hybrid mode with old version at $SPN_TEST_OLD_BIN"
+fi
+
+# Export variables
+export SPN_TEST_BIN
+export SPN_TEST_OLD_BIN
+export SPN_TEST_DATA_DIR
+export SPN_TEST_SHARED_DATA_DIR
+
+# Copy files.
+cp config-template.json ./testdata/shared/config-template.json
+cp entrypoint.sh ./testdata/shared/entrypoint.sh
+chmod 555 ./testdata/shared/entrypoint.sh
+
+# Run!
+docker compose -p spn-test-simple up --remove-orphans