Process environment variables defined in compose files (#736)

Reviewed-on: #736
Co-authored-by: David Boreham <david@bozemanpass.com>
Co-committed-by: David Boreham <david@bozemanpass.com>

stack_orchestrator/data/compose/docker-compose-test.yml

@@ -5,6 +5,7 @@ services:
     environment:
       CERC_SCRIPT_DEBUG: ${CERC_SCRIPT_DEBUG}
       CERC_TEST_PARAM_1: ${CERC_TEST_PARAM_1:-FAILED}
+      CERC_TEST_PARAM_2: "CERC_TEST_PARAM_2_VALUE"
     volumes:
       - test-data:/data
       - test-config:/config:ro

stack_orchestrator/data/container-build/cerc-test-container/run.sh

@@ -17,6 +17,9 @@ fi
 if [ -n "$CERC_TEST_PARAM_1" ]; then
   echo "Test-param-1: ${CERC_TEST_PARAM_1}"
 fi
+if [ -n "$CERC_TEST_PARAM_2" ]; then
+  echo "Test-param-2: ${CERC_TEST_PARAM_2}"
+fi
 
 if [ -d "/config" ]; then
   echo "/config: EXISTS"